[Excavator]

Hello WebLizzard,
If you nest #header in another container you can make #header center like the rest of your content and still have your black bar across the top.

Look how it acts when you do this -

#header {
    background-color: #000000;
    height: 130px;
    margin: 0 auto;
    position: relative;
    width: 750px;
}