* {
    margin: 0 auto;
    padding: 0;
    box-sizing: border-box;
}

.area{
    width: 600px;
    height: 600px;
    margin-top: 150px;
    border: dashed 2px #123465;
    position: relative;
    overflow: hidden;
}

.shape {
    position: absolute;
    transition: 0.2s;
}