I'm using a Mixit layout (Bookworm Blue) with a Plus Account and all I really want to do is change the header. I like absolutely everything else about the layout but I just want to change my header. I looked here and it gave me a CSS code which I then used appropriately. The image showed up...but it didn't replace the header I didn't want anymore. If this won't work simply because I have a Plus Account then I apologize for taking your time.
What can I do differently to just replace the header?
Here's the CSS code that I used:
background: #000000 url(http://i295.photobucket.com/albums/mm155/Reidluver/Firefliesheader1.jpg) no-repeat top center;
Thank you very much for your time.
EDIT: Thank you to josiefier for helping me with the problem!