Fix for issue 4053
Fix for issue 4053

Button hover was breaking due to IE6 not handling chained classes
properly.

alphagov/static,alphagov/static,tadast/static,robinwhittleton/static,kalleth/static,robinwhittleton/static,robinwhittleton/static,kalleth/static,tadast/static,kalleth/static,robinwhittleton/static,tadast/static,alphagov/static,tadast/static,kalleth/static