Color Styles
To add a color style to the theme, click on the "+" icon in front of the category.
The color value in the theme can be any of those available in CSS. A color from the theme can be set as a font color, block background color, border color, etc.
For example, to change the theme, go to the Typography section on the Styles panel, click on the 
icon next to the Color property and select the color you want.
