[Bug]: Color contrast for button selected state

[Sarah4VT]

Describe the bug

📌 Not sure if this is an actual accessibility bug as I'm basing this off my own perception.

When displaying the "thumbs up" icon in a selected and unselected state, the background on the button doesn't have a lot of color contrast so it's hard for me to easily tell which one is selected.

Nimbus Version Number

3.0.0

Browser + OS

Mac, Chrome

Priority

Medium

To Reproduce

1. Project Settings
2. Channels
3. Open new chat
4. Send a message to agent, wait to get response
5. Feedback buttons appear for agent response

Expected behavior

No response

Screenshots

Additional context

You can see the agent here: https://mc.eu-central-1.aws.escemo.com/lifestyle-01/settings/project/channels