It would be nice to have a color palette that automatically pop-ups when the user specifies a color in a CSS file.
Try this: github.com/weslly/ColorPicker
It's not automatic; you have to trigger it via a keybinding. In practice, that's probably for the best.
a little bit to understand the code in the github, it seems like that this plugin call some special API not directly from sublime text? still can not find the way to change the color of the text, not in a way of color theme