Answers for "how to set full image in background in css"

CSS make image fill whole background

html { 
  background: url(images/bg.jpg) no-repeat 
    center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

html background image fit to screen

body {
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
}

how to make an image a full background in html

I have set the fixed position, you can set it to whatever you want.

.bg-image {
   width: 100%;
   height: 100%;
   position: fixed;
   right: 0;
   left: 0;
   top: 0;
   bottom: 0;
 }