diff --git a/src/styles/_toolbar.scss b/src/styles/_toolbar.scss
index b3e9e0b..e54c1e7 100644
--- a/src/styles/_toolbar.scss
+++ b/src/styles/_toolbar.scss
@@ -105,6 +105,7 @@
     // HACK: <https://github.com/maputnik/editor/pull/392#issuecomment-427595172>
     color: $color-black !important;
     margin-left: 4px;
+    border-width: 0;
 
     option {
       // HACK: <https://github.com/maputnik/editor/pull/392#issuecomment-427595172>