The default button in RadButton control is rendered with an anchor and input inside it. Both html elements have background images coming from a sprite image that defines their background color, and it is not possible to set different color using pure CSS. Therefore you need to create custom skin where you should edit the sprite image with the button background elements with your preferred color palette.
You may find useful the following online resources: Tutorial: Creating RadButton Custom Skin
, or you could use Telerik Visual Style Builder
In case you want to use ButtonType="LinkButton", which is rendered with a pure CSS, you could change the background color using the necessary CSS properties.
All the best,
the Telerik team
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