Why is the logo floating in the mobile version?

Question

css

Good evening
The problem is the following
here is the site: a0078200.xsph.ru/index.html
In the mobile version, the logo runs into the menu as it didn’t work, it doesn’t work ....
The site is connected to the bootstrap
Please help if anyone is sitting on the site at such a time!

Answer 1

why do this shadow through the picture at all, if there is a box-shadow? also the shadow is crooked prntscr.com/beiuht

Answer 2

Here is a crutch for you
Through the media naturally. But that's just the menu. The banner is also under the logo. So there is more to fix.