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#overlay {
    background: rgba(0,0,0,0.7);
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: none;
    text-align: center;
}

#overlay img {
    margin-top: 10%;
}

#overlay p {
    color: white;
}

ul#gpGallery li {
    display: inline;
    text-align: center;
}
h1 {
    text-align: center;
}
.center {
    width: 30%;
    margin: 0 auto;
}