#my-popup {
    background-color: #fff;
    padding: 30px 30px 10px 30px;
    width: 300px;
    height: 100px;
    position: absolute;
    border: 3px solid #000;
    border-radius: 10px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 9999;
}
.close-popup {
    float: right;
    cursor: pointer;
    font-size: 10px;
}
.open-popup {
    display: inline-block;
    padding: 10px 20px;
    background-color: #333;
    color: #fff;
    cursor: pointer;
}