Issue #3219165: Inactive vertical tabs do not meet contrast requirements

css/components/vertical-tabs.css

@@ -57,7 +57,7 @@
   padding: 10px 15px 15px;
   text-decoration: none;
   border-bottom: 1px solid #b3b2ad;
-  background-color: #f2f2f0;
+  background-color: #f5f5ef;
   text-shadow: 0 1px hsla(0, 0%, 100%, 0.6);
 }
 .vertical-tabs__menu-item:last-child a {