web: add CSS rule for macro names (#397)

agda/agda#7325

Author: ncfavier

support/web/css/code.scss

@@ -99,6 +99,7 @@ a[href].hover-highlight {
 
   .Datatype               { color: theme(--primary) !important; }
   .Function               { color: theme(--primary) !important; }
+  .Macro                  { color: theme(--primary) !important; }
   .Postulate              { color: theme(--primary) !important; }
   .Primitive              { color: theme(--primary) !important; }
   .Record                 { color: theme(--primary) !important; }