can I define custom colors?

Is there any way to define a custom color, in the code files of a web site project?

I'd like to be able to define a pallette, using my own names, and then be able to use those names in aspx files.
I know I can define styles, and use CSS on controls. But it seems like I should be able to define a color name, and have it interpreted into the rgb during rendering.

For example, it would be something like:

color sage=(A0, B0, C0); // defining the color name

<body bgcolor=sage> //in the aspx




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