Wordpress Header Question

I launched a new website www.egamblingportals.com and using a wprdpress theme I like. The only problem is the header image is to big. By default it is 969 x 200 pixels. I have looked around to try to change this but I cant figure out how to. I would rather have it about 960x150.

Does anyone know if you can change this and if so how?

Thanks

Edit your css file and add this:

#logo {
clear: both;
width: 960px !important;
height: 150px !important;
}

the location of file should be: wp-content/themes/redline/style.css