.bg1{
  background-image: url("../img/bg1.jpg"); 
  background-repeat: no-repeat;
background-size: cover;
}
.bg2{
  background-image: url("../img/bg2.jpg"); 
  background-repeat: no-repeat;
background-size: cover;
}
@media (max-width: 768px) {
  .bg1, .bg2 {
    background-image: none;
  }

.hide0 {
display:none;
}
.hide1 {
display:visibility;
}