diff --git a/docs/input/assets/css/styles.scss b/docs/input/assets/css/styles.scss
index e7fde17..50d8592 100644
--- a/docs/input/assets/css/styles.scss
+++ b/docs/input/assets/css/styles.scss
@@ -18,6 +18,7 @@ $thebackground: $gray-200;
     display: inline-block;
     width: 60px;
     height: 15px;
+    border: 2px solid #000000;
 }
 
 #topnav {