If you're trying to specify a background color to enter into your HTML editor, the background image tag would look like this if your chosen color code were 990033:
<body bgcolor="#990033">
Although the colors below are not all the possible variations, they are the variations that will not cause 'dithering' in browsers on most platforms. Dithering is where a color shade is simulated by using a cross-hatch or other pattern to give the perception of a different color shade. Therefore, it's recommended you stay with a non-dithered color whenever possible.
Note: Ignore the RGB values since you'll not normally need them for specifying colors on a Web page.
