diff --git a/plugins/plugin-manager b/plugins/plugin-manager
index 5b87f63..ea992c3 160000
--- a/plugins/plugin-manager
+++ b/plugins/plugin-manager
@@ -1 +1 @@
-Subproject commit 5b87f63f3e9c5817bcddf008c0b4005494059368
+Subproject commit ea992c3b37eed5493c7031ee20faba9dd875170f
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts
index 70e146f..a3afc5c 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts
+++ b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view_html.ts
@@ -24,11 +24,6 @@
     /* Workaround for empty style block - see https://github.com/Polymer/tools/issues/408 */
   </style>
   <style include="gr-page-nav-styles">
-    gr-dropdown-list {
-      --trigger-style: {
-        text-transform: none;
-      }
-    }
     .breadcrumbText {
       /* Same as dropdown trigger so chevron spacing is consistent. */
       padding: 5px 4px;
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts
index e1013e1..a9b4ece 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item_html.ts
@@ -273,7 +273,7 @@
     <gr-date-formatter
       withTooltip
       forceRelative
-      relativeOptionNoAge
+      relativeOptionNoAgo
       date-str="[[_computeWaiting(account, change)]]"
     ></gr-date-formatter>
   </td>
diff --git a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts
index 4778890..a55befb 100644
--- a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view_html.ts
@@ -42,11 +42,6 @@
       justify-content: space-between;
       padding: var(--spacing-xs) var(--spacing-l);
     }
-    .banner gr-button {
-      --gr-button: {
-        color: var(--primary-text-color);
-      }
-    }
     .hide {
       display: none;
     }
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts
index b5f55ca..d21c29f 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions_html.ts
@@ -33,6 +33,9 @@
       /* px because don't have the same font size */
       margin-left: 8px;
     }
+    gr-button {
+      display: block;
+    }
     #actionLoadingMessage {
       align-items: center;
       color: var(--deemphasized-text-color);
@@ -57,10 +60,8 @@
         flex-wrap: wrap;
       }
       gr-button {
-        --gr-button: {
-          padding: var(--spacing-m);
-          white-space: nowrap;
-        }
+        --gr-button-padding: var(--spacing-m);
+        white-space: nowrap;
       }
       gr-button,
       gr-dropdown {
diff --git a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
index 831a309..771f666 100644
--- a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
@@ -514,7 +514,7 @@
         .actions gr-checks-action,
         .actions gr-dropdown {
           vertical-align: top;
-          --padding: 0 var(--spacing-m);
+          --gr-button-padding: 0 var(--spacing-m);
         }
         .actions #moreMessage {
           display: none;
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
index 85f0330..651a640 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_html.ts
@@ -93,9 +93,7 @@
     }
     .fileViewActions gr-button {
       margin: 0;
-      --gr-button: {
-        padding: 2px 4px;
-      }
+      --gr-button-padding: 2px 4px;
     }
     .editMode .hideOnEdit {
       display: none;
diff --git a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
index 35f01d8..f7be36b 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list_html.ts
@@ -256,9 +256,7 @@
       display: inline-block;
       visibility: hidden;
       vertical-align: bottom;
-      --gr-button: {
-        padding: 0px;
-      }
+      --gr-button-padding: 0px;
     }
     .row:focus-within gr-copy-clipboard,
     .row:hover gr-copy-clipboard {
diff --git a/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts b/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
index c9680ef..7f3e9de 100644
--- a/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-message/gr-message_html.ts
@@ -132,7 +132,7 @@
     }
     .dateContainer .patchsetDiffButton {
       margin-right: var(--spacing-m);
-      --padding: 0 var(--spacing-m);
+      --gr-button-padding: 0 var(--spacing-m);
     }
     span.date {
       color: var(--deemphasized-text-color);
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
index 1973fe6..0beb91c 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
@@ -177,7 +177,7 @@
     }
     .attention .edit-attention-button {
       vertical-align: top;
-      --padding: 0px 4px;
+      --gr-button-padding: 0px 4px;
     }
     .attention .edit-attention-button iron-icon {
       color: inherit;
diff --git a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
index b081be7..d115899 100644
--- a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list_html.ts
@@ -42,15 +42,13 @@
       display: inline-block;
     }
     gr-button.addReviewer {
-      --padding: 1px 4px;
+      --gr-button-padding: 1px 0px;
       vertical-align: top;
       top: 1px;
     }
     gr-button {
       line-height: var(--line-height-normal);
-      --gr-button: {
-        padding: 0px 0px;
-      }
+      --gr-button-padding: 0px;
     }
     gr-account-chip {
       line-height: var(--line-height-normal);
diff --git a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
index 6ed5a2c..3eb28c9 100644
--- a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list_html.ts
@@ -51,11 +51,8 @@
       margin-right: var(--spacing-s);
     }
     gr-dropdown-list {
-      --trigger-style: {
-        color: var(--primary-text-color);
-        text-transform: none;
-        font-family: var(--font-family);
-      }
+      --trigger-style-text-color: var(--primary-text-color);
+      --trigger-style-font-family: var(--font-family);
     }
     .filter-text, .sort-text, .author-text {
       margin-right: var(--spacing-s);
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-action.ts b/polygerrit-ui/app/elements/checks/gr-checks-action.ts
index aed07e0..558ec56 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-action.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-action.ts
@@ -43,7 +43,7 @@
           white-space: nowrap;
         }
         gr-button {
-          --padding: var(--spacing-s) var(--spacing-m);
+          --gr-button-padding: var(--spacing-s) var(--spacing-m);
         }
         paper-tooltip {
           text-transform: none;
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-results.ts b/polygerrit-ui/app/elements/checks/gr-checks-results.ts
index 68c7957..245660d 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-results.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-results.ts
@@ -816,6 +816,7 @@
         }
         .headerTopRow .right .goToLatest gr-button {
           margin-right: var(--spacing-m);
+          --gr-button-padding: var(--spacing-s) var(--spacing-m);
         }
         .headerBottomRow iron-icon {
           color: var(--link-color);
@@ -975,23 +976,11 @@
   }
 
   override render() {
-    // To pass CSS mixins for @apply to Polymer components, they need to appear
-    // in <style> inside the template.
-    /* eslint-disable lit/prefer-static-styles */
-    const style = html`<style>
-      .headerTopRow .right .goToLatest gr-button {
-        --gr-button: {
-          padding: var(--spacing-s) var(--spacing-m);
-          text-transform: none;
-        }
-      }
-    </style>`;
     const headerClasses = classMap({
       header: true,
       notLatest: !!this.checksPatchsetNumber,
     });
-    return html`${style}
-      <div class="${headerClasses}">
+    return html` <div class="${headerClasses}">
         <div class="headerTopRow">
           <div class="left">
             <h2 class="heading-2">Results</h2>
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-runs.ts b/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
index 76fa353..4cb87bd 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-runs.ts
@@ -426,11 +426,11 @@
           flex-grow: 1;
         }
         .title gr-button {
-          --padding: var(--spacing-s) var(--spacing-m);
+          --gr-button-padding: var(--spacing-s) var(--spacing-m);
           white-space: nowrap;
         }
         .title gr-button.expandButton {
-          --padding: var(--spacing-xs) var(--spacing-s);
+          --gr-button-padding: var(--spacing-xs) var(--spacing-s);
         }
         :host(:not([collapsed])) .expandButton {
           margin-right: calc(0px - var(--spacing-m));
diff --git a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
index c2066d7..eb55177 100644
--- a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
+++ b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.ts
@@ -82,6 +82,7 @@
       css`
         gr-dropdown {
           padding: 0 var(--spacing-m);
+          --gr-button-text-color: var(--header-text-color);
         }
         gr-avatar {
           height: 2em;
@@ -99,9 +100,6 @@
     const customStyle = html`
       <style>
         gr-dropdown {
-          --gr-button: {
-            color: var(--header-text-color);
-          }
           --gr-dropdown-item: {
             color: var(--primary-text-color);
           }
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js
index 16db22d..ed3ffe0 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.js
@@ -17,19 +17,16 @@
 
 import '../../../test/common-test-setup-karma.js';
 import './gr-diff-host.js';
-import {GrDiffBuilderImage} from '../gr-diff-builder/gr-diff-builder-image.js';
-import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
+
 import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.js';
-import {Side, createDefaultDiffPrefs} from '../../../constants/constants.js';
-import {createChange, createCommentThread, createComment} from '../../../test/test-data-generators.js';
-import {CoverageType} from '../../../types/types.js';
-import {
-  addListenerForTest,
-  mockPromise,
-  stubRestApi,
-} from '../../../test/test-utils.js';
-import {EditPatchSetNum, ParentPatchSetNum} from '../../../types/common.js';
+import {createDefaultDiffPrefs, Side} from '../../../constants/constants.js';
 import {_testOnly_resetState} from '../../../services/comments/comments-model.js';
+import {createChange, createComment, createCommentThread} from '../../../test/test-data-generators.js';
+import {addListenerForTest, mockPromise, stubRestApi} from '../../../test/test-utils.js';
+import {EditPatchSetNum, ParentPatchSetNum} from '../../../types/common.js';
+import {CoverageType} from '../../../types/types.js';
+import {GerritNav} from '../../core/gr-navigation/gr-navigation.js';
+import {GrDiffBuilderImage} from '../gr-diff-builder/gr-diff-builder-image.js';
 
 const basicFixture = fixtureFromElement('gr-diff-host');
 
@@ -1172,8 +1169,8 @@
         },
       }));
 
-      const threads = dom(element.$.diff)
-          .queryDistributedElements('gr-comment-thread');
+      const threads =
+          dom(element.$.diff).queryDistributedElements('gr-comment-thread');
 
       assert.equal(threads.length, 1);
       assert.equal(threads[0].diffSide, diffSide);
@@ -1196,8 +1193,8 @@
         },
       }));
 
-      const threads = dom(element.$.diff)
-          .queryDistributedElements('gr-comment-thread');
+      const threads =
+          dom(element.$.diff).queryDistributedElements('gr-comment-thread');
       assert.equal(threads.length, 0);
       assert.isTrue(alertSpy.called);
     });
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
index 4f1047f..b25be5a8 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_html.ts
@@ -141,11 +141,6 @@
     .separator.hide {
       display: none;
     }
-    gr-dropdown-list {
-      --trigger-style: {
-        text-transform: none;
-      }
-    }
     .editButtona a {
       text-decoration: none;
     }
diff --git a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts
index ebbb0d6..26944a4 100644
--- a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts
+++ b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select_html.ts
@@ -33,11 +33,8 @@
       margin: 0 var(--spacing-m);
     }
     gr-dropdown-list {
-      --trigger-style: {
-        color: var(--deemphasized-text-color);
-        text-transform: none;
-        font-family: var(--font-family);
-      }
+      --trigger-style-text-color: var(--deemphasized-text-color);
+      --trigger-style-font-family: var(--font-family);
     }
     @media screen and (max-width: 50em) {
       .filesWeblinks {
diff --git a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.ts b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.ts
index 3b026b3..8821725 100644
--- a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.ts
+++ b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.ts
@@ -15,6 +15,7 @@
  * limitations under the License.
  */
 import '../../../styles/shared-styles';
+import '../../shared/gr-tooltip/gr-tooltip';
 import {GrTooltip} from '../../shared/gr-tooltip/gr-tooltip';
 import {customElement, property} from '@polymer/decorators';
 import {flush} from '@polymer/polymer/lib/legacy/polymer.dom';
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.ts b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.ts
index db45c33..418c368 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.ts
+++ b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.ts
@@ -49,6 +49,9 @@
           display: flex;
           justify-content: flex-end;
         }
+        gr-dropdown {
+          --gr-button-padding: var(--spacing-xs) var(--spacing-s);
+        }
         #actions {
           margin-right: var(--spacing-l);
         }
@@ -62,12 +65,6 @@
     /* eslint-disable lit/prefer-static-styles */
     const customStyle = html`
       <style>
-        gr-button,
-        gr-dropdown {
-          --gr-button: {
-            height: 1.8em;
-          }
-        }
         gr-dropdown {
           --gr-dropdown-item: {
             background-color: transparent;
diff --git a/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.ts b/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.ts
index ae3853e..6036a99 100644
--- a/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.ts
+++ b/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.ts
@@ -78,6 +78,7 @@
           font-weight: var(--font-weight-bold);
           margin-left: var(--spacing-l);
           text-decoration: none;
+          --gr-button-padding: 0;
         }
       `,
     ];
@@ -94,18 +95,8 @@
   }
 
   override render() {
-    // To pass CSS mixins for @apply to Polymer components, they need to appear
-    // in <style> inside the template.
-    /* eslint-disable lit/prefer-static-styles */
-    const style = html`<style>
-      .action {
-        --gr-button: {
-          padding: 0;
-        }
-      }
-    </style>`;
     const {text, actionText} = this;
-    return html`${style}
+    return html`
       <div class="content-wrapper">
         <span class="text">${text}</span>
         <gr-button
@@ -116,7 +107,8 @@
           >${actionText}
         </gr-button>
         ${this.renderDismissButton()}
-      </div> `;
+      </div>
+    `;
   }
 
   /**
diff --git a/polygerrit-ui/app/elements/shared/gr-button/gr-button.ts b/polygerrit-ui/app/elements/shared/gr-button/gr-button.ts
index 4467ba6..7017c9c 100644
--- a/polygerrit-ui/app/elements/shared/gr-button/gr-button.ts
+++ b/polygerrit-ui/app/elements/shared/gr-button/gr-button.ts
@@ -72,7 +72,10 @@
             --button-background-color,
             var(--default-button-background-color)
           );
-          --text-color: var(--default-button-text-color);
+          --text-color: var(
+            --gr-button-text-color,
+            var(--default-button-text-color)
+          );
           display: inline-block;
           position: relative;
         }
@@ -83,40 +86,6 @@
           text-transform: none;
         }
         paper-button {
-          /* The next lines contains a copy of paper-button style.
-            Without a copy, the @apply works incorrectly with Polymer 2.
-            @apply is deprecated and is not recommended to use. It is expected
-            that @apply will be replaced with the ::part CSS pseudo-element.
-            After replacement copied lines can be removed.
-          */
-          @apply --layout-inline;
-          @apply --layout-center-center;
-          position: relative;
-          box-sizing: border-box;
-          min-width: 5.14em;
-          margin: 0 0.29em;
-          background: transparent;
-          -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
-          -webkit-tap-highlight-color: transparent;
-          font: inherit;
-          text-transform: uppercase;
-          outline-width: 0;
-          border-top-left-radius: var(--border-radius);
-          border-top-right-radius: var(--border-radius);
-          border-bottom-right-radius: var(--border-radius);
-          border-bottom-left-radius: var(--border-radius);
-          -moz-user-select: none;
-          -ms-user-select: none;
-          -webkit-user-select: none;
-          user-select: none;
-          cursor: pointer;
-          z-index: 0;
-          padding: var(--spacing-m);
-
-          @apply --paper-font-common-base;
-          @apply --paper-button;
-          /* End of copy*/
-
           /* paper-button sets this to anti-aliased, which appears different than
             bold font elsewhere on macOS. */
           -webkit-font-smoothing: initial;
@@ -128,27 +97,23 @@
           justify-content: center;
           margin: var(--margin, 0);
           min-width: var(--border, 0);
-          padding: var(--padding, 4px 8px);
-          @apply --gr-button;
+          padding: var(--gr-button-padding, var(--spacing-s) var(--spacing-m));
         }
-        /* https://github.com/PolymerElements/paper-button/blob/2.x/paper-button.html */
-        /* BEGIN: Copy from paper-button */
         paper-button[elevation='1'] {
-          @apply --paper-material-elevation-1;
+          box-shadow: var(--elevation-level-1);
         }
         paper-button[elevation='2'] {
-          @apply --paper-material-elevation-2;
+          box-shadow: var(--elevation-level-2);
         }
         paper-button[elevation='3'] {
-          @apply --paper-material-elevation-3;
+          box-shadow: var(--elevation-level-3);
         }
         paper-button[elevation='4'] {
-          @apply --paper-material-elevation-4;
+          box-shadow: var(--elevation-level-4);
         }
         paper-button[elevation='5'] {
-          @apply --paper-material-elevation-5;
+          box-shadow: var(--elevation-level-5);
         }
-        /* END: Copy from paper-button */
         paper-button:hover {
           background: linear-gradient(rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0.12)),
             var(--background-color);
@@ -192,7 +157,9 @@
         :host([link]) {
           --background-color: transparent;
           --margin: 0;
-          --padding: var(--spacing-s);
+        }
+        :host([link]) paper-button {
+          padding: var(--gr-button-padding, var(--spacing-s));
         }
         :host([disabled][link]),
         :host([loading][link]) {
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
index d1496fb..ee4c02f 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment_html.ts
@@ -89,10 +89,7 @@
       justify-content: flex-end;
     }
     .rightActions gr-button {
-      --gr-button: {
-        height: 20px;
-        padding: 0 var(--spacing-s);
-      }
+      --gr-button-padding: 0 var(--spacing-s);
     }
     .editMessage {
       display: none;
@@ -190,10 +187,8 @@
     }
     #deleteBtn {
       display: none;
-      --gr-button: {
-        color: var(--deemphasized-text-color);
-        padding: 0;
-      }
+      --gr-button-text-color: var(--deemphasized-text-color);
+      --gr-button-padding: 0;
     }
     #deleteBtn.showDeleteButtons {
       display: block;
diff --git a/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.ts b/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.ts
index 0cd522a..38b1e9f 100644
--- a/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.ts
+++ b/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.ts
@@ -81,29 +81,19 @@
         iron-icon {
           color: var(--deemphasized-text-color);
           vertical-align: top;
+          --iron-icon-height: 20px;
+          --iron-icon-width: 20px;
+        }
+        gr-button {
+          display: block;
+          --gr-button-padding: 2px;
         }
       `,
     ];
   }
 
   override render() {
-    // To pass CSS mixins for @apply to Polymer components, they need to appear
-    // in <style> inside the template.
-    /* eslint-disable lit/prefer-static-styles */
-    const customStyle = html`
-      <style>
-        iron-icon {
-          --iron-icon-height: 20px;
-          --iron-icon-width: 20px;
-        }
-        gr-button {
-          --gr-button: {
-            padding: 2px;
-          }
-        }
-      </style>
-    `;
-    return html`${customStyle}
+    return html`
       <div class="text">
         <iron-input
           class="copyText"
@@ -137,7 +127,8 @@
             <iron-icon id="icon" icon="gr-icons:content-copy"></iron-icon>
           </gr-button>
         </gr-tooltip-content>
-      </div> `;
+      </div>
+    `;
   }
 
   focusOnCopy() {
diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
index 9ec1d39..2ff1936 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list_html.ts
@@ -78,9 +78,8 @@
       width: 100%;
     }
     gr-button {
-      --gr-button: {
-        @apply --trigger-style;
-      }
+      font-family: var(--trigger-style-font-family);
+      --gr-button-text-color: var(--trigger-style-text-color);
     }
     gr-date-formatter {
       color: var(--deemphasized-text-color);
diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts b/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts
index 4bd98d6..3c07d94 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown_html.ts
@@ -33,7 +33,6 @@
     }
     gr-button {
       vertical-align: top;
-      @apply --gr-button;
     }
     gr-avatar {
       height: 2em;
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
index c303bed..e711e9d 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label_html.ts
@@ -72,7 +72,7 @@
       --iron-icon-width: 18px;
     }
     gr-button.pencil {
-      --padding: 0px 0px;
+      --gr-button-padding: 0px 0px;
     }
   </style>
   <template is="dom-if" if="[[!showAsEditPencil]]">
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
index 076553b..adca888 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account_html.ts
@@ -45,9 +45,7 @@
     .action {
       border-top: 1px solid var(--border-color);
       padding: var(--spacing-s) var(--spacing-l);
-      --gr-button: {
-        padding: var(--spacing-s) var(--spacing-m);
-      }
+      --gr-button-padding: var(--spacing-s) var(--spacing-m);
     }
     .attention {
       background-color: var(--emphasis-color);
diff --git a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
index 552bd08..1186ee1 100644
--- a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info_html.ts
@@ -65,13 +65,13 @@
     tr {
       min-height: var(--line-height-normal);
     }
+    gr-tooltip-content {
+      display: block;
+    }
     gr-button {
+      display: block;
       vertical-align: top;
-      --gr-button: {
-        height: var(--line-height-normal);
-        width: var(--line-height-normal);
-        padding: 0;
-      }
+      --gr-button-padding: 1px;
     }
     gr-button[disabled] iron-icon {
       color: var(--border-color);
diff --git a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.ts b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.ts
index 2b9a868..0585aec8 100644
--- a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.ts
+++ b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.ts
@@ -40,7 +40,7 @@
   @property({type: String, attribute: 'max-width', reflect: true})
   maxWidth?: string;
 
-  @property({type: Boolean})
+  @property({type: Boolean, attribute: 'show-icon'})
   showIcon = false;
 
   // Should be private but used in tests.
diff --git a/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.ts b/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.ts
index 9092919..40434a9 100644
--- a/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.ts
+++ b/polygerrit-ui/app/mixins/keyboard-shortcut-mixin/keyboard-shortcut-mixin.ts
@@ -1100,12 +1100,6 @@
 
 /** The interface corresponding to KeyboardShortcutMixin */
 export interface KeyboardShortcutMixinInterface {
-  Shortcut: typeof Shortcut;
-  ShortcutSection: typeof ShortcutSection;
-  _shortcut_go_key_last_pressed: number | null;
-  _shortcut_v_key_last_pressed: number | null;
-  _shortcut_go_table: Map<string, string>;
-  _shortcut_v_table: Map<string, string>;
   keyboardShortcuts(): {[key: string]: string | null};
   createTitle(name: Shortcut, section: ShortcutSection): string;
   bindShortcut(shortcut: Shortcut, ...bindings: string[]): void;