body {
    background: #515151 url("../img/logo_extended_white_font.png") center center no-repeat fixed;
    margin: 0;
    padding: 0;
}

#certificates {
    display: block;
    width: 100%;
    background-color: whitesmoke;
    position: absolute;
    bottom: 0;
    height: 120px;
    padding: 15px 0;
    text-align: center;
}

#certificates img {
    margin: 0 30px;
}