At 1024px, a horizontal scroll appears from behind the burger! How to fix?

Question

css

At 1024px and below, a horizontal scroll appears because of the burger! How to fix?

https://roderen.github.io/onegin/
https://github.com/Roderen/onegin

Answer 1

Solved a problem!
It was necessary to place the menu burger itself in and prescribe for<header><header> position: relative;