html, body
{
    height: 100%;
    margin:0;
    padding:0;
}

div {
    position:relative;
    height: 100%;
    width:100%;
}

div img {
    position:absolute;
    top:0;
    left:0;
    right:0;
    bottom:0;
    margin:auto;
} 

.img {
     width: 100%;
     height: auto;
   
}

@media screen and (min-width: 1280px)
{
    
 .img {
     width: 30%;
     height: auto;
   
}   
    
}