Make width 100%

Hello

I’m trying to make the width of my site’s “branding”-area 100% auto, but i am unable to do it somehow.

I am using this code for my site’s footer, and it works fine:

#site-generator {
    background: none repeat scroll 0 0 #EEEEEE;
    border-top: 1px solid #B5B5B5;
    font-size: 13px;
    left: 0;
    margin: 20px auto auto;
    padding: 5px 0;
    position: absolute;
    width: 100%;
}

But when i place the same code for the site’s branding, it won’t work.

Help please?

My site