Background with Css

Full Page Background Images
html{
  height:100%
  background:url(bg.jpg) no-repeat center center;
 background-size:cover;
}

Multiple Background Images
html{
  background:url(bg1.jpg) no-repeat top left,  background:url(bg2.jpg) no-repeat bottom-right,  background:url(bg3.jpg) no-repeat bottom left;
}