How much skill is needed to get your Header Navigation Responsive?

Hello this is [My Page](,
I have added one more Page in the Header Navigation, it Looks ok on Desktop, but on Mobile it does not Look great. So i changed the Mobile View to Overlay Menu.

Can I get this done by adding custom css?

If yes, is it possible for somebody who is not de developer? Appreciate any recommandations!

I am using Wpfrost theme and Gutenberg and Siteground Plugins. Have no other Plugins installed


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