SleekAnnounce allows you to add fully customized, 100% responsive announcements to your WordPress site. It also works perfectly as a Cookie Notification, which is a requirement for many sites. It includes a simple to use yet sophisticated admin section that let’s you change every aspect of the announcement banners, and uses custom CSS to create the gradients and other style options.

Demo: http://codecanyon.net/item/sleekannounce-responsive-announcements-and-cookie-notifications/14014898