Color on Shortcode insert that creates a button

I am trying to insert a button with shortcode into my Elementor editing tool.
Creating the button works, but it seems to take the color from the theme, which I can’t seem to change.
So I was trying to edit the shortcode to force the color..

Original without color:
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Added color.
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But it doesn’t change anything.

Is there anything else I need to update or is the coding incorrect?

thanks