Bacground fullscreen + center text

by lovromar

HTML

<div class="header" id="top">
        <div class="vert-text">
            <h1>Start Bootstrap</h1>
            <h3>
                <em>We</em> Build Great Templates,
                <em>You</em> Make Them Better</h3>
            <a class="btn btn-default btn-lg" href="#about">Find Out More</a>
        </div>
    </div>

CSS

html, body {
    height: 100%;
    width: 100%;
    margin:0;
    padding:0;
}

.header {
    background: url("http://startbootstrap.com/templates/stylish-portfolio/css/../img/bg.jpg") no-repeat fixed center center / cover rgba(0, 0, 0, 0);
    display: table;
    height: 100%;
    position: relative;
    width: 100%;
}

.vert-text {
    display: table-cell;
    text-align: center;
    vertical-align: middle;
}