css fixed image code example

Example 1: html static background

body {
  background-image: url("img_tree.gif");
  
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  
  background-size: cover;
}

Example 2: how fixed image at top

.cust_sticky {           /* div  */
    position: fixed;
}