This page contains a neutral colors chart and a general-purpose color chart. You can use the colors in the palettes with either HTML or CSS. Click on the color code to select it, then you can copy and paste it. Click on the Toggle button to convert from Hex to RGB and back. The charts are printed in tabular fashion so you can narrow your browser window with the palette and compare the colors to your design side-by-side.
The neutral colors are taken from a Behr Premium Plus Interior/Exterior paint color swatch found at a hardware store. The paper was scanned into Paint Shop Pro, where the swatch color was averaged and extracted. Colors with a blue or green tint are termed cool, while colors with a red or yellow tint are warm. Grays and white are totally neutral. Neutral colors can be used as background colors for tables and pages.
Do not use the color names in your code, because they are non-standard. Use either the HEX or RGB values.