I use the excellent `rainbow-mode` to highlight colors in CSS files.

![css with rainbow-mode][1]

However, this assumes I know what color I want. Are there any color pickers that I can use for CSS editing inside Emacs?

Alternatively, I've noticed `customize-face` offers a color picker from a set of 548 colors. Can I use this for CSS?

![customize-face color picker][2]


  [1]: https://i.sstatic.net/UEubI.png
  [2]: https://i.sstatic.net/k7dLf.png