Hi.
Thank you for choosing our product.
You can navigate to footer template in the Theme Builder and click edit. You can find “Back to Top” and “Phone Call” widgets In the template and adjust their colors from the style section: https://prnt.sc/bex9wwJjQ45s
For the other two buttons, you can just click them and change their color from the style section too.
https://prnt.sc/weXWcCxKhrbB
Hope this helps.
Best regards,
Sophia