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 718fa17..17b3187 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -55,11 +55,15 @@
         background-color: var(--table-header-background-color);
       }
       .image-diff .gr-diff {
+        background-color: var(--table-header-background-color);
         text-align: center;
       }
       .image-diff img {
+        box-shadow: 0 1px 3px rgba(0, 0, 0, .3);
         max-width: 50em;
-        outline: 1px solid var(--border-color);
+      }
+      .image-diff .right.lineNum {
+        border-left: 1px solid var(--border-color);
       }
       .image-diff label,
       .binary-diff label {