Changes only applied on the homepage

Hello,

I made some changes to the appearance on the home page. for example, I changed the background color of the main navigation menu at the top (via CSS editor). When I click through the other pages on the site, the background color is not the same. How can I make it so all the pages are consistent in this way?

Thanks

Hello,

Can you please provide a link to your website to let me inspect it?

Kind Regards, Roman.