Visual Studio tool: Add color picker tool to your visual studio
This help you choose better color when you editing your css's color. CSS color picker
After you installed this tool to your visual studio, then open your css file. It'll look like following.
When you click the color link with Ctrl, you could see following link which able to edit your color.
this's tool could be helpful, if you don't remember color's number, and it might help you to choose better color.