diff --git a/common/common.scss b/common/common.scss
index de6b325..e306c60 100644
--- a/common/common.scss
+++ b/common/common.scss
@@ -54,7 +54,7 @@ body textarea {
   max-width: 808px;
   button {
     margin-left: 1em;
-    background-color: lighten($secondary, 10%);
+    background-color: var(--material-lighter-secondary);
   }
 }