Show a right border on sidebar

website/pages/playground/index.html

@@ -131,6 +131,10 @@
 
     /* display as 2x2 grid */
     @media (min-width: 800px) {
+      .options-container {
+        border-right: 0;
+      }
+
       .editor {
         flex-basis: 50%;
         border-left: 1px solid #ddd;
@@ -196,6 +200,7 @@
       width: 225px;
       height: 100%;
       border-bottom: 1px solid #ddd;
+      border-right: 1px solid #ddd;
       flex: 0 1 auto;
     }