What can cause a block cap to pop out?

Question

css

baevda0n.beget.tech
There is a site where the header starts to pop up at 800 pixels. I can't understand why. Apparently the bootstrap classes intersected with mine somewhere. What could be the problem?

Answer 1

I didn’t really understand what it means to climb out ..
But if you need to stretch the cap to its full width, then: