diff --git a/src/scss/theme/default/layout.scss b/src/scss/theme/default/layout.scss
index 831e7a16..4aef1feb 100644
--- a/src/scss/theme/default/layout.scss
+++ b/src/scss/theme/default/layout.scss
@@ -27,6 +27,7 @@
       background: transparent;
       border: none;
       outline: 0;
+      box-shadow: none;
     }
   }