modal.css

#franz-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.8);
}

#franz-modal .modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 30%;
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    border-radius: 3px;
}

#franz-modal .close {
    color: #aaa;
    float: right;
    margin-top: -10px;
    font-size: 20px;
    font-weight: bold;
}

#franz-modal .close:hover,
#franz-modal .close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}