body, html {
  margin: 0;
  overflow: hidden;
  background-image: url("123.jpg");
  background-color: white;
  background-repeat: no-repeat;
  background-size: cover;
}
  
.div1 {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size:40px;
}