CSS code to put custom header

Hi, I have a blog called: http://www.logolitic.com. I tried to put a custom header, with a code found in another post. I did this, and it worked but it puts from Downloads tab to right! The left side remains like now, this gray gradient. I made the header with exactly dimmensions like is now.

Please, give me the css code for my header to put it and to fit perfectly.

Thanks,
http://www.logolitic.com