how to change background in css code example

Example 1: how to change the page background in css

body {
  /* this changes the page's background to green  */
  background-color: green;
}

Example 2: css change background color of page

/* Use the following code: */
html {background-color: #fefefe;} 
/* You can change the hexedecimal code to RGB, RGBA, name & more colors!*/

Example 3: background css

body {
  background: #ffffff url("img_tree.png") no-repeat fixed right top;
}