diff --git a/client/galaxy/style/scss/history.scss b/client/galaxy/style/scss/history.scss
index 3e0f29cad25..f10fd6fb070 100644
--- a/client/galaxy/style/scss/history.scss
+++ b/client/galaxy/style/scss/history.scss
@@ -71,7 +71,7 @@
             .annotation {
                 background: white;
                 border-radius: 3px;
-                border: 1px solid fadeout($layout-border-color, 50%);
+                border: 1px solid fade-out($layout-border-color, .5);
                 padding: 4px;
                 white-space: pre-wrap;
                 overflow: auto;
diff --git a/static/style/blue/base.css b/static/style/blue/base.css
index e1a1e05c123..628fbb6a882 100644
--- a/static/style/blue/base.css
+++ b/static/style/blue/base.css
@@ -14214,7 +14214,7 @@ pre.peek {
   .history-panel > .controls .annotation-display .annotation {
     background: white;
     border-radius: 3px;
-    border: 1px solid fadeout(#999, 50%);
+    border: 1px solid rgba(153, 153, 153, 0.5);
     padding: 4px;
     white-space: pre-wrap;
     overflow: auto; }