.mySVG {
  background-image: url(rocknrolla.svg);
  background-repeat: no-repeat;
  background-size: 30%;
  background-position: center;
  background-attachment: fixed;
}

@media (max-width: 480px) {
  .mySVG {
    background-size: 90%;
  }
}

@media (min-width: 481px) and (max-width: 1024px) {
  .mySVG {
    background-size: 70%;
  }
}