body, html {
  background-image: url("marjan-blan-marjanblan-9tqAeLDQT-o-unsplash.jpg");
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
  background-color: #000000;
  margin: 0px;
}

h1 {
  font-family: 'Poppins', sans-serif;
  font-weight: 100; 
  font-style: italic;
  font-size: 30px;
  margin: 0;
  color: white;
  position: absolute;
  top: 50%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

@media only screen and (min-width: 768px) {
  h1 {
    font-family: 'Poppins', sans-serif;
    font-weight: 60;
    font-style: italic;
    font-size: 100px;
    margin: 0;
    color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
  }
}