Is there an existing issue for this?

• I have searched the existing issues

Description of problem

Currently when scrolled you see this:

Which "hides the header in a way.

Description of solution

IMO adding a bit of a separation would be good:

Animated gif with and then without border:

Used as test:
border-bottom: solid 1px #25678a;

Description of alternatives considered

No response

Anything else?

No response

Do you plan to contribute code for this enhancement?

• Yes

Would you be interested in sponsoring this enhancement?

• Yes

Code of Conduct

• I agree to follow this project's Code of Conduct