.html .banner-fix-bg{
  background-size:cover;
  background-repeat: no-repeat;
  height:100vh;
  background-attachment: fixed;
}



@media (max-width: 991px){
  .html .banner-fix-bg{
    height: 640px;
    background-attachment: unset;
  }
}

@media (max-width: 640px){
  .html .banner-fix-bg{
    height: 240px;
  }
}