body{
    background-color:black;
}
#image_div img {
    width: 100%;
    height: auto;
    background-repeat: no-repeat;
    background-size: cover;
    padding-top: 50%;
}

@media screen and (max-width: 1024px) {
    /*#image_div img {
        left: 50%;
        margin-left: -512px;
    }*/
}