diff --git a/polygerrit-ui/app/elements/diff/gr-diff-comment-thread/gr-diff-comment-thread.html b/polygerrit-ui/app/elements/diff/gr-diff-comment-thread/gr-diff-comment-thread.html
index 1ed7ac7266..3a0c3ad52b 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-comment-thread/gr-diff-comment-thread.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff-comment-thread/gr-diff-comment-thread.html
@@ -25,6 +25,7 @@ limitations under the License.
       :host {
         border: 1px solid #bbb;
         display: block;
+        margin-bottom: 1px;
         white-space: normal;
       }
       #container {