diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
index 2b89a7a..313fa2a 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -165,6 +165,10 @@
         /* >> character */
         content: '\00BB';
       }
+      .trailing-whitespace {
+        border-radius: .4em;
+        background-color: #FF9AD2;
+      }
     </style>
     <style include="gr-theme-default"></style>
     <div class$="[[_computeContainerClass(_loggedIn, viewMode, displayLine)]]"