Please note this will only have an effect on elements with selectedable
choices, e.g. checkbarInput().
active(.tag, color)A tag element.
One of "red", "purple", "indigo", "blue", "cyan",
"teal", "green", "yellow", "amber", "orange", "grey", "white"
specifying the active color of selected choices.
Other design: affix,
background, border,
display, float,
font, height,
padding, scroll,
shadow, width