Tired of the Byz banner and background not matching, so I figured I'd make a very simple guide to getting a proper background color.
Open your banner in photoshop or a program with similar abilities, select the "eyedropper tool", you know those waves your banner would have if it'd based on the normal banner background? Click on the upper part of those waves, the lighter part. Now, click on the new color displayed in the color picker (place which shows your colors), if you're using photoshop it'll show a color code, just copy paste that code as your banner background and you're done, if not, then go to this
http://html-color-codes.info/ website. Scroll down until you reach a part entitled "HTML Color Picker", look at the numbers there, copy and paste the valid numbers from your photoshop/paint/something else color picker into this thing and once it's all written down you should get the right code to insert as your banner background as well.