Click the Settings tab in the Properties window.
In the Background section, you can type in the Red, Green, and Blue (RGB) values for the Top and Bottom halves of the background. Alternatively, click the ellipsis to open the Colors dialog box.
In the Standard tab, move your cursor to one of the 16 basic system colors that you want to use.
Click Custom, and create a color by clicking inside the matrix. Then, drag the HSV slider up or down to change the Hue, Saturation, and Luminance values of the selected color.
The system automatically updates the background. The background settings now apply for each model you open.