Fix breadcrumb as overlay

Author: nfisher

_tpl/index.html

@@ -73,7 +73,7 @@
             </div>
         </div>
     </div>
-    <div class="pagehead bg-gray pb-3 pt-3 border-0 mb-5 border-bottom">
+    <div class="pagehead bg-gray pb-3 pt-3 border-0 mb-5 border-bottom color-bg-overlay">
         <div class="d-flex px-3 px-md-4 px-lg-5">
             <div class="flex-auto min-width-0 width-fit mr-3">
                 <nav aria-label="Breadcrumb">