CSS Multiple Wrapper Layout Scheme

Often, when developing, you come across layouts in which blocks have a background that spans the entire width of the page, and the content of these blocks is centered. Here is an example of such a layout:

In such a layout, we will have to make not one wrapper, but several - for each block. At the same time, inside the wrapper there should be another block that performs content centering. There should also be a class responsible for painting the content with a background.

The general outline of our layout will look like this:

html<div class="wrapper">
  <div class="center">
    
  </div>
</div>
<div class="wrapper line">
  <div class="center">
    
  </div>
</div>
<div class="wrapper">
  <div class="center">
    
  </div>
</div>
<div class="wrapper line">
  <div class="center">
    
  </div>
</div>

The center class will be used to center the blocks:

css.center {
  width: 800px;
  padding: 20px;
  margin: 0 auto;
}

The line class will be used to color the blocks:

css.wrapper.line {
  background-color: #008040;
  color: white;
}

And the wrapper class will be the parent of each block. We use it to set the indentation between blocks:

css.wrapper {
  margin-bottom: 30px;
}

Let's now write the full code for our task:

html<div class="wrapper">
  <div class="center">
    <h1>Main site header</h1>
  </div>
</div>
<div class="wrapper line">
  <div class="center">
    <h2>Our company</h2>
    <p>
      ...
    </p>
    <p>
      ...
    </p>
  </div>
</div>
<div class="wrapper">
  <div class="center">
    <h2>Our price</h2>
    <p>
      ...
    </p>
    <p>
      ...
    </p>
  </div>
</div>
<div class="wrapper line">
  <div class="center">
    <h2>Our contacts</h2>
    <p>
      ...
    </p>
    <p>
      ...
    </p>
  </div>
</div>

css* {
  box-sizing: border-box;
}
body {
  margin: 0;
}

.wrapper {
  margin-bottom: 30px;
}
.wrapper.line {
  background-color: #008040;
  color: white;
}
.center {
  width: 800px;
  padding: 20px;
  margin: 0 auto;
}
.wrapper h1 {
  margin: 0;
  font: 40px "Times New Roman";
}
.wrapper h2 {
  margin: 0;
  font: 25px "Times New Roman";
}
.wrapper p {
  font: 16px/1.4 Arial;
  text-align: justify;
}