What causes horizontal scrolling on a responsive website?

Question

Adaptive design

I'm testing under the iPhone 5 user agent and a horizontal scroll appears on it on the main page. In general, I can’t buy what and why this scroll causes.
Site: idever.ru

Answer 1

I went with an iPhone 5, there is no scrolling.

Answer 2

Your problem is that if you open it in the desktop version and gradually reduce the screen, a scroll appears, it is likely that it just hits the useragent, under the resolution where it appears, solve the problem at the root so that there is no scroll at all, and then your problem will be solved, a great example is to look at the bootstrap grid, how they did it.
getbootstrap.com

Answer 3

Bro, it's not responsive on certain screen sizes, for example from 768px to 1040px wide you don't have responsiveness at all. That is, on this section of the width, you need to write your own media queries, thereby solving the problem.