diff --git a/resources/cider-ui-tests/style.less b/resources/cider-ui-tests/style.less
index 7d3823cb..ba0afddd 100644
--- a/resources/cider-ui-tests/style.less
+++ b/resources/cider-ui-tests/style.less
@@ -79,7 +79,7 @@ body[platform='linux'] {
 }
 
 #app {
-  --color1: rgb(30, 30, 30, 30%);
+  --color1: rgba(30, 30, 30, 30%);
   --color2: rgba(15, 15, 15, 70%);
   /* --color1: rgb(30, 30, 31, 20%);
   --color2: rgba(17, 17, 17, 24%); */