diff --git a/src/lib/viewers/doc/_docBase.scss b/src/lib/viewers/doc/_docBase.scss
index 30b1c4fd4..0ba601c45 100644
--- a/src/lib/viewers/doc/_docBase.scss
+++ b/src/lib/viewers/doc/_docBase.scss
@@ -271,6 +271,11 @@ $thumbnail-sidebar-width: 226px;
             }
         }
 
+        // For legacy Annotations highlight selection
+        .rangy-highlight {
+            opacity: .2;
+        }
+
         ::selection {
             background-color: fade-out($box-blue, .9);
         }