Centering a background image, using CSS

background-image: url(path-to-file/img.jpg);
background-repeat:no-repeat;
background-position: center center;

That should work.

If not, why not make a div with the image and use z-index to make it the background? This would be much easier to center than a background image on the body.

Other than that try:

background-position: 0 100px;/*use a pixel value that will center it*/ Or I think you can use 50% if you have set your body min-height to 100%.

body{

    background-repeat:no-repeat;
    background-position: center center;
    background-image:url(../images/images2.jpg);
    color:#FFF;
    font-family:Arial, Helvetica, sans-serif;
    min-height:100%;
}

I use this code, it works nice

html, body {
  height: 100%;
  width: 100%;
  padding: 0;
  margin: 0;
  background: black url(back2.png) center center no-repeat;;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}

I think this is what is wanted:

body
{
    background-image:url('smiley.gif');
    background-repeat:no-repeat;
    background-attachment:fixed;
    background-position:center;
}