diff --git a/apps/common/main/resources/less/toolbar.less b/apps/common/main/resources/less/toolbar.less
index a67edef75d..acb7444a26 100644
--- a/apps/common/main/resources/less/toolbar.less
+++ b/apps/common/main/resources/less/toolbar.less
@@ -713,7 +713,7 @@
                     border-top-width: @underscore_height;
                     content: '';
                     position: absolute;
-                    margin-left: 6px;
+                    .margin-left-6();
                     width: calc(100% - 12px);
                     bottom: -@underscore_height;
                     opacity: 0;