.img-100 {
    height: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding-top: 50%;
    position: relative;
}
.img-100 img {
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}