Submit Requirements - Center align horizontally the icon in hovercard

Screenshot: https://imgur.com/a/3zDHypk
Google-Bug-Id: b/202268316
Change-Id: Ib3ec1ee57038f3b835ca4d2bd33abe89c6c16477
diff --git a/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard_html.ts b/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard_html.ts
index 192a812..b7b4d9c 100644
--- a/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-submit-requirement-hovercard/gr-submit-requirement-hovercard_html.ts
@@ -51,13 +51,13 @@
     div.section {
       margin: 0 var(--spacing-xl) var(--spacing-m) var(--spacing-xl);
       display: flex;
+      align-items: center;
     }
     div.sectionIcon {
       flex: 0 0 30px;
     }
     div.sectionIcon iron-icon {
       position: relative;
-      top: 2px;
       width: 20px;
       height: 20px;
     }