#one-click-order-popup {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
    display: none;
}
.popup-content {
    background-color: #fff;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    position: relative;
}
#close-popup {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}
#close-popup:hover,
#close-popup:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}