delete css folder

git-svn-id: https://plugins.svn.wordpress.org/formget-contact-form/trunk@907331 b8457f37-d9ea-0310-8a92-e5e31aec5664
add new css file

git-svn-id: https://plugins.svn.wordpress.org/formget-contact-form/trunk@907332 b8457f37-d9ea-0310-8a92-e5e31aec5664