improved styling of calendar view

git-svn-id: https://plugins.svn.wordpress.org/the-holiday-calendar/trunk@1039457 b8457f37-d9ea-0310-8a92-e5e31aec5664
minor style change

git-svn-id: https://plugins.svn.wordpress.org/the-holiday-calendar/trunk@1039458 b8457f37-d9ea-0310-8a92-e5e31aec5664