Merge pull request #5125 from tapcanvas/tab-body-bg

Use @bodyBackground on .nav-tabs active state instead of static color

less/navs.less

@@ -123,7 +123,7 @@
 .nav-tabs > .active > a,
 .nav-tabs > .active > a:hover {
   color: @gray;
-  background-color: @white;
+  background-color: @bodyBackground;
   border: 1px solid #ddd;
   border-bottom-color: transparent;
   cursor: default;