body { 
background-color: #000000;
top:0; left:0; right:0;
min-height:100%;
margin:0;
padding:0;
width:100%;
} 

img.bg {
  /* Set rules to fill background */

  min-height: 100%;
  min-width: 1024px;
	
  /* Set up proportionate scaling */
  width: 100%;
  height: auto;
	
  /* Set up positioning */
  position: fixed;
  top: 0;
  left: 0;
    padding:0;
}

@media screen and (max-width: 1024px) { /* Specific to this particular image */
  img.bg {
    left: 50%;
    margin-left: -512px;   /* 50% */
  }
}