Responsive background image - centered

by yeyene

HTML

<div id="image"></div>

CSS

#image {
    float:left;
    width:100%;
    height:400px;
    background: url('http://stylonica.com/wp-content/uploads/2014/02/nature-wallpaper-362.jpeg') no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}