Please consult the help documentation of your graphics software to see if this option is available. The RGB values can be useful for creating images that match the background color in your graphics program. The specifics of entering RGB values varies, please see the help documentation for your graphics software package for information. This option applies only to background graphics. There are several layouts available for the backgrounds.
Some layouts have only a left margin and others have a left and right margin.
Once you have selected a design, you will be given a set of layout options on the design display page. The numbers in the layout list represent the number of pixels in the width of each area of the background. Are caused by refreshing, resizing or going back in your browser. These can be cured by First, selecting either the terms of use or this help page. Next, using your browser's refresh button.