body {
  background-image: url(/img/dis/bghome.jpg);
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
}

@media only screen and (max-width: 767px) {
  body {
    background-image: url(/img/dis/bghomecel.jpg);
    background-size: 100% auto;
    background-position: top center;
  }
}