main.css

body{
    font-family: Helvetica, Arial, sans-serif;
    color: #666;
}

#overlay{
    -webkit-transition: all .2s;
    -moz-transition: all .2s;
    -ms-transition: all .2s;
    -o-transition: all .2s;
    transition: all .2s;
    height: 100%;
    width: 100%;
    display: inline-block;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    background: black;
    opacity: 0;
}

#overlay.overlay-active{
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=80);
    opacity: .8;
}

.lightbox{
    border-radius: 6px;
    background: white;
    box-shadow: 0 0 16px rgba(0, 0, 0, .4);
    position: absolute;
    width: 500px;
    height: 200px;
    top: 0;
    left: 50%;
    margin-top: 10%;
    margin-left: -250px;
    z-index: 2;
    opacity: 0;
    display: none;
}

.lightbox.lightbox-active{
    display: inline-block;
    opacity: 1;
}

h1{ text-align: center; }