CSS: Get a center-positioned fluid image background

Question

This has been annoying me now for a few hours as I keep fiddling around with the code and don't seem to be getting anywhere at all.

I really like the way that this website has a fluid image background:

Here

I have downloaded the code and am not currently trying to make a slideshow, but instead a single image background that when you play around with the size of your browser expands and contracts the same way as in the website.

If i take the code that they use in their CSS and apply it to my own image I keep getting this instead.

https://jsfiddle.net/9cpz4gua/

body{
        background-image:url(https://blogs-images.forbes.com/ericsavitz/files/2011/03/smiley-face.jpg?width=960);
    background-repeat:no-repeat;
        width: 100%;
    height: 100%;
    position: absolute;
    top: 0px;
    left: 0px;
    color: transparent;
    background-size: cover;
    background-position: 50% 50%;
    background-repeat: none;
    opacity: 0;
    z-index: 0;

        }

Could someone please advise me what to do in order to get my background image to expand and contract about the center as the website does?

Answer 1

Here is my answer, it may not be the easiest or the most complete but it give a very beautiful looking result that answers your question

Basically, you create a new div directly under your body and style it this way:

.bgimg {
    z-index: 1;
    background: url(http://dondev.ovh/light_abstract.jpg);
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0px;
    left: 0px;
    background-size: cover;
    background-position: 50% 50%;
    background-repeat: no-repeat;
}

See it in action

This is a css only answer, you can use JavaScript alongside for better result.

Regards

Answer 2

If all you want is to have your image always fill the page, just remove some things from your own style to achieve the "cover" effect.

Try this:

body{
    background-image:url(https://blogs-images.forbes.com/ericsavitz/files/2011/03/smiley-face.jpg?width=960);
    background-repeat:no-repeat;
    color: transparent;
    background-size: cover;
    opacity: 0;
    z-index: 0;
}

https://jsfiddle.net/9cpz4gua/2/