I don't know if there's a package to show the colors according to their value. I know it's xah-css-mode and rainbow-mode.
rainbow-mode only shows hex values and by name.
xah-css-mode shows the above, hsl and supposedly rgb (it seems to have an error with this).
Is there a way to see hsla and rgba? Transparency is not necessary, but it would be enough to show the color hsl or rgb without removing the suffix "a".
And I'm also looking for a package that is a color picker, with the function to change the format between hex, hsl, rgb.
Something like color-picker in atom. Thanks :).