Slack Clone / Help with changing Channels' color after clicking it

I’ve been stuck all day on this seemingly simple concept: how do i change the color of a channel’s button after I click it or unclick it?

These channel buttons are in a Repeating Group. As the photo shows, I want to change the channel’s text color or background when a user clicks on it so they know what channel they are in. Just like the Slack example screenshot i uploaded. It seems so simple but can’t find the answer!

Screen Shot 2021-01-28 at 5.44.36 PM

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