Changing Color & Icons in Select Field

I have a single select field with Yes/No options. Instead of soft Blue/Green I would like Bright Green and Bright Red plus different icons that are more obvious. I have a PRO account but this is my first attempt at this. Do I have do use a Block to accomplish this? If so which one?

You can select the color of the single select by clicking on the arrow near the option in the field like so:

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Aaron - perfect. One of those little obvious once you show me things. Thanks for the help!!!