Bootstrap Package 4.x Navbar bg color

Hi,

I’m new here and hope you’re doing well.
Also I hope the topic “Bootstrap Package” is here on the right place.

I’ve set the navbar background color via less in a previous version. Now with version4 this is not possible anymore via constant editor or TypoScript. Perhaps I’ve not found a possibility yet…

What is the best way for changing the color of the navbar, or make it transparent?

Thanks.

Best,
Wolfgang