img.test {
    position:absolute;
left:0px;
top:0px;
z-index:-1;
  object-fit: contain;
}

@media (min-width: 480px) { //for mobile devices 
  .banner {
    min-height: 125px
   }
}

@media (min-width: 768px) { // for tablets
  .banner {
    min-height: 255px
   }
}