Fix Dropdown being obscured by other elements

increased z-index of dropdown-menu to prevent it from being obscured by other page elements

p/themes/base-theme/template.css

@@ -256,7 +256,7 @@ a.btn {
 }
 .dropdown-target:target ~ .dropdown-menu {
 	display: block;
-	z-index: 10;
+	z-index: 1000;
 }
 .dropdown-close {
 	display: inline;