html, body {
    margin: 0;
    height: 100%;
    overflow-y: hidden;
}

img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    -webkit-transition: all .9s ease-in-out;
    -moz-transition: all .9s ease-in-out;
    transition: all .9s ease-in-out;
}