Help with CSS code

I am trying to build a website for my magazine scans and I am going to be using drop down menus for the site using css code. Well I got what i want done but there is a strip above the main image that I can't get rid of. Its like there is a little section above the main image instead of the main image being completely at the top of the page there is a gap and I want to get rid of the gap. If anyone can help me with it it would be greatly appreciated.

Here is what I have thrown together. It is far from done it's just a template and it is going to look a lot different than this.

Smooth Criminal Designz Scans

The gap I am talking about is at the very top of the page.

You may have a 'padding' or 'margin' setting in the CSS code active. If you're using divs then it will be under whatever you set the banner to be under and can be easily fixed through that.

Thanks a lot for the response. I was messin with the CSS page trying to change something and i modified the margin part which was set at 24px and i changed it to 0 and it fixed it. Thanks for responding though i appreciate it.