Change tailwind colors with css variables

[radel]

Tailwind config is using Hex color, It would be nice if the colors were defined as CSS variables so we can switch theme on the fly and tailwind would follow.

ex:

const colors = {
  // other colors here
  grey: 'var(--grey)',
}

:root {
//other colors here
  --grey: '#b8c2cc',
}