.point {
    position: absolute;
    border-radius: 100%;
    width: 35px;
    height: 35px;
    background-color: #86a;
    text-align: center;
    user-select: none;
    z-index: 64;
}
#z0 {
    left: 519px;
    top: 519px;
}
#z1 {
    left: 619px;
    top: 619px;
}