How to make the content fixed and the background the full width of the screen?

Question

css

welovepavel.esy.es/Kivi/HTML.html
https://qiwi.com like theirs.

Thanks!

Answer 1

nest the content block inside the background block, of course

<section>
<div class="content"></div>
</section>

section{
   width: 100%;
  background-color: blue;
}
.content{
  margin: 0 auto;
  width: 1200px;
}

Answer 2

Click on qiwi.com F12 and make "kakunih"...

Answer 3

Your max-width is 1300, what do you want?