How to Set a Background Image on particular page code example

Example 1: full page background image in html

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;
}

Example 2: how to set background image for web page in html local image

body {  background-image: url(/path/to/image.png); }