.sitopay-popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}
.sitopay-popup-content {
    background: #fff;
    margin: 10% auto;
    padding: 20px;
    width: 90%;
    max-width: 500px;
    position: relative;
}
.sitopay-close {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 20px;
    cursor: pointer;
}
.sitopay-popup-content form p {
    margin-bottom: 15px;
}
.sitopay-popup-content form label {
    display: block;
    margin-bottom: 5px;
}
.sitopay-popup-content form input[type="text"],
.sitopay-popup-content form input[type="file"] {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
}
.sitopay-popup-content form button {
    padding: 10px 20px;
    background: #0071a1;
    color: #fff;
    border: none;
    cursor: pointer;
}