Why is the screen eating?

Question

css

Good afternoon. I'm learning to typeset and stumbled upon this problem:
when the screen resolution is reduced (less than 400 px) (along the vertical axis), a part of the screen is eaten up with a white background through the code inspector in Chrome.
Help me to understand. Thank you!

Answer 1

because adaptive curve)) you need to edit the blocks that stick out.

Answer 2

Let me look at the code if you want the exact answer. So fortune-telling on coffee grounds.
And set the no-repeat property, otherwise the picture is duplicated.