CSS fix

git-svn-id: https://plugins.svn.wordpress.org/wp-simple-booking-calendar/trunk@787589 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added tested up to: 3.7

git-svn-id: https://plugins.svn.wordpress.org/wp-simple-booking-calendar/trunk@793461 b8457f37-d9ea-0310-8a92-e5e31aec5664