Fixes #12526: Add scrollbars when necessary to the Dashboard example's sidebar

docs/examples/dashboard/dashboard.css

@@ -34,6 +34,8 @@ body {
     left: 0;
     z-index: 1000;
     display: block;
+    overflow-x: hidden;
+    overflow-y: auto; /* Scrollable contents if page is short */
     padding: 70px 20px 20px;
     background-color: #f5f5f5;
     border-right: 1px solid #eee;