#img1 {
    position: relative;
    border: 5px solid lightblue;
}



#img1 > img:last-child {
    position: absolute;
    top: 50px;
    right: 500px;
    width: 400px;
    height: 400px;
    border: 5px solid royalblue;
}
#img2 :nth-child(1){
    position: absolute;
    top: 150px;
    right: 500px;
    width: 400px;
    height: 400px;
    border: 5px solid royalblue;
}
#img2 :nth-child(2) {
    position: absolute;
    top: 560px;
    right: 500px;
}
#img2 :nth-child(3) {
    position: absolute;
    top: 600px;
    right: 500px;
}