<section>
  <h2>titre 1</h2>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo veniam, aperiam harum iusto id aut atque inventore nihil dolores amet suscipit dolorem minima modi est hic distinctio sapiente similique recusandae!</p>
</section>
<div class="img1"></div>
<section>
  <h2>Titre 3</h2>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo veniam, aperiam harum iusto id aut atque inventore nihil dolores amet suscipit dolorem minima modi est hic distinctio sapiente similique recusandae!</p>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo veniam, aperiam harum iusto id aut atque inventore nihil dolores amet suscipit dolorem minima modi est hic distinctio sapiente similique recusandae!</p>
</section>
<div class="img2"></div>
<section>
  <h2>Titre 3</h2>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo veniam, aperiam harum iusto id aut atque inventore nihil dolores amet suscipit dolorem minima modi est hic distinctio sapiente similique recusandae!</p>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Explicabo veniam, aperiam harum iusto id aut atque inventore nihil dolores amet suscipit dolorem minima modi est hic distinctio sapiente similique recusandae!</p>
</section>
h2{
  font-size: 2.5em;
  color: grey;
}
p{
  font-size: 2em;
  color: grey;
}
.img1,.img2{
  height: 200px;
  background-attachment: fixed;
  background-size: cover;
  background-position: 0 center;
}
.img1{
  background-image: url(https://tutovisuel.com/dawn-190055_960_720.jpg);
}
.img2{
  background-image: url(https://tutovisuel.com/east-586257_960_720.jpg);
}
Rerun