Keep image centered - html

Question

I have this simple html:
<img src="http://i1.ytimg.com/vi/XWGszmviDpA/maxresdefault.jpg" class="bg">
So far i centered the image correctly as long as the window is not smaller than the image. Now i have problems to keep the face in the middle when the window is smaller! How can i fix this?
For me its important that the image height stays 100% of the window.
My css:
img.bg {
width: auto;
height: 100%;
position: fixed;
left:0;
right:0;
margin:0 auto;
}
Thanks!
http://jsfiddle.net/67jDp/1/

Answer 1

Try using it as a background-image.
CSS:
.bg {
background-image:url('http://i1.ytimg.com/vi/XWGszmviDpA/maxresdefault.jpg');
width: auto;
height: 100%;
position: fixed;
left:0;
right:0;
margin:0 auto;
width:70%; //Custom dimension
background-position:center;
background-size:cover;
}
Demo: http://jsfiddle.net/lotusgodkk/67jDp/2/

Answer 2

Try setting the image as the background of a div instead of an img tag
http://jsfiddle.net/CeVwN/1/
.bg {
background-image:url('http://i1.ytimg.com/vi/XWGszmviDpA/maxresdefault.jpg');
background-position:center;
background-size: auto 100%;
background-repeat: no-repeat;
width: auto;
height: 100%;
position: fixed;
left:0;
right:0;
margin:0 auto;
}

Answer 3

You can use this with little javascript
css :
img.bg {
height: 100%;
position: fixed;
left:50%;
}
JS :
var i = $('img');
var w = i.width();
i.css({marginLeft: -w/2});
$( window ).resize(function() {
i.css({marginLeft: -w/2});
});
DEMO : http://jsfiddle.net/67jDp/4/

Answer 4

Set width to 100% to get always the container's width. Then, set height to auto to allow the ratio:
img.bg {
width: 100%;
height: auto;
position: fixed;
left:0;
right:0;
margin:0 auto;
}
Remember to set a max-width to stop expanding when necessary.