/* Mask for background, by default is not display */
#mask {
    display: none;
    background: #ccc;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 10;
    width: 100%;
    height: 100%;
    opacity: 0.8;
    z-index: 999;
}

/* You can customize to your needs  */
#message-modal, #subscribe-modal {
    display: none;
    background: #333;
    padding: 10px;
    float: left;
    font-size: 120%;
    position: fixed;
    top: 50%;
    left: 50%;
    z-index: 99999;
    
}