How do I change the colours of the menu buttons?

Open the screen.css file from the path,

Root/templates/atomic/css/blueprint/plugins/joomla-nav/screen.css

And search the below class and change the background color.

.Thanks.

I dont have that directory, all I have in the templates directory is \beez3, \protostar, and \system. No sign of that file when doing a search either. I am using the Joomla 3.x version if this makes any difference. Please advise, many thanks

For Joomla 3.X,

Open the template.css file from the path,

Root/templates/protostar/css/template.css

And search the below class and change the background color.

Thanks.