CC Button Background won't change colour - what am I missing?

I have a CC button turned on (via variable trigger) on my slide.  In the colour settings I have turned on the background to something bright - and it seems to work in the settings when I try it. (image 1)  

But when I preview or publish the slide, the button appears almost white (image 2) and is almost invisible.

What am I missing or doing wrong?

 

Here is another thread, but didn't seem to answer my question.
https://community.articulate.com/discussions/articulate-storyline/background-color-of-cc-button-when-cc-is-turned-on

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