How to make the menu button one color on the front page and another on the rest

Hello!

The title pretty much says it all. I’ve a problem where on the front page I need the menu button to be white, because my slider is dark/black. On all the other pages the background is white so I need it to be black. So basically:

1. Frontpage needs to have regular/white menu button.
2. Every other page needs to have a black menu button.

Anyone who can help with this? I’d be very grateful. I’ve tried just about everything and I cannot come up with anything that works, but you guys are much smarter and more developed with CSS than me, so I was hoping maybe one of you could?

Thank you so much in advance!

https://www.ads-software.com/plugins/css/