#avvisoLinkEsterno {
    display: none;
    position: fixed;
    z-index: 99999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.9);
}

#avvisoLinkEsterno .modal-dialog {
    margin: 0 auto;
    top: 0;
    position: absolute;
    width: 80%;
}

#avvisoLinkEsterno .modal-content {
    background-color: #fefefe;
    padding: 20px;
    border: 1px solid #888;
    width: 50%;
    margin: 20px auto 0;
    min-width: 300px;
}