Untitled

body, h1 {
  margin: 0;
  color: white;
}

header {
  height: 100vh;
  background-color: #eee;
  background-image: url(https://pictures.s3.yandex.net/frontend-developer/free-course/cover.jpg);
  background-size: cover;
  background-position: center;
}

h1 {
  font-size: 140px;
  
}

div {
  width: 250px;
  height: 250px;
  background-color: rgb(255, 255, 255);
}