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;
}

how to cover full image in css

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

css full cover background image

body { 
  background: url(path/to/bg-image.jpg) no-repeat center center fixed;
  background-size: cover;
}

make background image full width

html {
    height: 100%;
}
body {
    color: #999;
    background: url('../images/background/main_bg.jpg') no-repeat center center fixed;
    font-family: 'Roboto', sans-serif;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}