.dio-wrapper {
    position: relative;
    width: 100%;
}
.dio-image-1 {
    position: relative;
    width: 80%;
    z-index: 1;
}
.dio-image-1 img, .dio-image-2 img {
    max-width: 100%;
    width: 100%;
    height: auto;
    display: block;
}
.dio-image-2 {
    position: absolute;
    width: 40%;
    top: 0;
    left: 0;
    z-index: 2;
}