Colors

For the "Color" Option the theme tries to display the color in a box instead of a dropdown of text.

In order for this to work only use css colors for the name of a color. E.g. "red" is a valid color name but "space red" is not.

Here is a list of all valid colors: https://www.w3schools.com/cssref/css_colors.asp

AFAIK this is not case-sensitive.