Type background:.

Type transparent or color, where color is a color name or hex color.

If desired, type url(image.gif), to use an image for the background.

If desired, type repeat to tile the image both horizontally and vertically, repeat-x to tile the image only horizontally, repeat-y to tile the image only vertically, or no-repeat to not tile the image.

If desired, type fixed or scroll to determine whether the background should scroll along with the canvas.

If desired, type x y to set the position of the background image, where x and y can be expressed as a percentage or as an absolute distance. Or use values of top, center, or bottom for x and left, center, and right for y.