, 20% 40%);
        }
        .ref-shape {
            position: absolute;
            background-color: green;
        }
        #ref-1 {
            top: 70px;
            left: 70px;
            width: 180px;
            height: 80px;
        }
        #ref-2 {
            top: 150px;
            left: 150px;
            width: 100px;
            height: 20px;
        }
        #ref-3 {
            top: 170px;
            left: 130px;
            width: 120px;
            height: 60px;
        }
    </st