Hello @Heidi_Dungarvin ,
All of the coloring is tied to the Design tab for button, text, and background coloring. Based on the screencap, you're using the older email editor, which will have some significantly different capabilities in how to setup some specialty blocks, including RSVP blocks. I'd recommend moving over to our current email builder sooner rather than later, to make sure you're using the actively-developed and maintained builder.
If the RSVP block's functionalities aren't working for what you're needing, I'd recommend utilizing a different block type or method of RSVPing the contacts. Some options include:
Setting up a poll block, and using the click results from that.
Setting up click-segmented buttons to confirm the RSVP, so the contacts add themselves to an applicable list for the event.
Setting up a survey page so they can select which they want to attend, and to collect other pertinent info if desired.
Setting up an event so they can fully RSVP for the event and get the full details in follow-up emails tied to the specific event.
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