Adding hover effect for LHS menu icon

web/sass-files/sass/partials/_headers.scss

@@ -96,6 +96,10 @@
 			right: 22px;
 			.dropdown-toggle {
 				padding: 10px;
+				@include opacity(0.8);
+				&:hover {
+					@include opacity(1);
+				}
 			}
 			.dropdown-menu {
 				li a {