<div class="container">
    <h1>YOUR CONTENT GOES HERE!</h1>
  </div>

body{
  height: 1000vh;
}

.container{
  width: 100%;
  height: 500px;
  background-position: center;
  background-size: cover;
  background-image: url(https://images.pexels.com/photos/421129/pexels-photo-421129.jpeg?cs=srgb&dl=pexels-nicolas-postiglioni-421129.jpg&fm=jpg);
  background-attachment: fixed;

  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
}