/mdn2/en-US/docs/Web/CSS/CSS_colors
Applying_color Color_picker_tool Color_values Relative_colors Using_color_wisely
/mdn2/en-US/docs/Web/CSS/CSS_colors/Color_valuesColor_values
/mdn2/en-US/docs/Web/CSS/CSS_colors/Using_color_wiselyUsing_color_wisely