Changing the colour of one button in my main nav

Hello! I have custom code creating two buttons in my main nav and I want to just target one of them to change the colour. Is there a way for me to change the background colour of just the "Match with a Therapist" button in my header nav and leave "Book an Appointment" as is?

https://goldfish-wrasse-48kn.squarespace.com/
password: igc

How have you added the second button?

@Ziggy I added the button by following this post which lead me to this solution and it worked like a gem!

@isabellarossi593 thank you, that's how I started out but had a hard time finding the correct identifier. I can't seem to find an ID when I inspect the code for the button so I tried to use the href for that button to help identify it but I must have been doing that wrong. This probably all boils down to me not being able to find/use the correct identifier.

@Ziggy That worked perfectly!! Thank you so much!

14 hours ago, hey_sp said:

@Ziggy That worked perfectly!! Thank you so much!

You're welcome!

You can change nth-child(1) to  nth-child(2) if you want to target the other button.