diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.html b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.html
index 471560d..90d9997 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.html
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.html
@@ -135,15 +135,15 @@
         line-height: var(--line-height-mono);
         margin-right: var(--spacing-l);
         margin-bottom: var(--spacing-l);
-        /* Account for border and padding */
-        max-width: calc(72ch + 2px + 2*var(--spacing-m));
+        /* Account for border and padding and rounding errors. */
+        max-width: calc(72ch + 2px + 2*var(--spacing-m) + 0.4px);
       }
       .commitMessage gr-linked-text {
         word-break: break-word;
       }
       #commitMessageEditor {
-        /* Account for border and padding */
-        min-width: calc(72ch + 2px + 2*var(--spacing-m));
+        /* Account for border and padding and rounding errors. */
+        min-width: calc(72ch + 2px + 2*var(--spacing-m) + 0.4px);
       }
       .editCommitMessage {
         margin-top: var(--spacing-l);