Nav-Menu Bar | Changing background color, font and font color

Hi there,

Can anyone tell me how should i do to change:

* Background Color of the Nav-Menu bar
* Font Color of the Nav-Menu bar
* Font of the Nav-Menu bar (optional)

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Website Link: https://www.cenius.it/GSO/

I’ve already tried to go in the Style.css and search for the Hex Color of the Nav-Menu bar, i’ve changed it but it won’t change on the navigation bar itself, it has only changed on the left side and the right side (i should put use red) of the nav-menu. Can anyone tell me how can i change it?

Pleaseeeeeee ??

Thanks a lot!