The option name is definitely
color … it’s what Im using on the demo page:
If you expand the get the shortcode plus sign you can see the shortcode I used for the demos.
I triple checked in the code to make sure.
If you’re copy/pasting … make sure you only do that while the
Text tab is active in the WordPress page editor. If you paste while using the
Visual tab, content can be pasted in that breaks WordPress’s ability to properly read the shortcode. I suggest switching it to the Text tab and making sure there is no unexpected code mixed in the shortcode.