how to get a background in css as a photo code example

Example 1: css background image

background-image: url("image.png");
background-position: center;
background-repeat: no-repeat;
background-size: cover;

Example 2: background image css

html,body {
  background-image: url("your.picture");
}

Example 3: adding background image

body{background-image: url("paper.gif");}