WebSafe Colors 
WebSafe colors are colors that will be displayed correctly on all browsers/platforms. If possible, your graphics should consist of these colors only. If this is too much trouble, you should use these colors as your primary colors.
Websafe colors are defined by RGB pairs of FF, CC, 99, 66, 33 and 00. The picture below shows all 216 websafe colors.
More info: Tips from c|net.
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