BuddyPress.org

It’s because you’ve got a repeat on that header so when smaller and height increases on header it repeats. You can try something like this:

`#header {
background: url(http://www.releasethereal.com/wp-content/uploads/2012/06/Header-Workerwithout-line.png)0 bottom no-repeat;
}`

It depends on what theme you are using. Usually yes you can put that in your style.css and it would work.