set default color on hover for banner link

Author: raclim

client/styles/components/_banner.scss

@@ -7,10 +7,11 @@
   border-bottom: 1px solid #000;
 
   a {
-    color: #000;
+    color: $black;
   }
 
   a:hover {
+    color: $black;
     text-decoration: underline;
   }