The crucial part here is to set up the height of your content as 100% relative to the viewport (html
element). By applying the background image to a div
and not just using an img
you also have a lot more flexibility in how its displayed, background-position
keeps it always centered, background-size:cover
keeps it scaled.
Demo Fiddle
HTML
<div></div>
<div>More Content</div>
CSS
html, body {
height:100%;
width:100%;
position:relative;
margin:0;
padding:0;
}
div:first-of-type {
height:100%;
width:100%;
background-image:url(https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcSbcnkIVXLz23PALu8JD-cTGe8KbXKC1JV0gBM_x1lx3JyaNqE7);
background-size:cover;
background-position:center center;
}
div:last-of-type {
background:green;
position:relative;
color:white;
height:100%;
}