diff --git a/dev/scss/header/menu.scss b/dev/scss/header/menu.scss
index 0016420..7baa398 100644
--- a/dev/scss/header/menu.scss
+++ b/dev/scss/header/menu.scss
@@ -51,6 +51,10 @@
   @include choose-item;
 }
 
+ul.menu:hover > div.ruler {
+  opacity: 1;
+}
+
 ul.menu {
   position: absolute;
   padding: 0;
@@ -59,6 +63,36 @@
   list-style-type: none;
   list-style-position: outside;
 
+  > div.ruler {
+    position: absolute;
+    right: 0px;
+    margin-right: -12px;
+    background-color: transparent;
+    width: 12px;
+    height: 100%;
+    opacity: 0;
+
+    > span {
+      position: absolute;
+      display: block;
+      right: 0px;
+      width: 6px;
+      cursor: pointer;
+      background-color: $light-grey;
+      border-radius: 3px;
+      z-index: 600;
+    }
+
+    > div {
+      position: absolute;
+      right: 1px;
+      width: 4px;
+      background-color: $dark-grey;
+      height: 100%;
+      border-radius: 2px;
+    }
+  }
+
   /**
    * List items
    */