diff --git a/css/_toolbars.scss b/css/_toolbars.scss
index d235d78b5..bdb2d37fd 100644
--- a/css/_toolbars.scss
+++ b/css/_toolbars.scss
@@ -66,6 +66,7 @@
     top: 0px;
     left: 0px;
     padding-top: 10px;
+    box-sizing: border-box;
     flex-direction: column;
     flex-wrap: nowrap;
     justify-content: flex-start;