why will use css background image code example

Example 1: background image

div {
  background-color: #ffffff;
  background-image: url("img_tree.png");
  background-repeat: no-repeat;
  background-attachment: scroll|fixed|local|initial|inherit;
  background-position: right top  |  x% y%  |  xpos ypos;
  background-clip: border-box|padding-box|content-box|initial|inherit;
  background-size: auto|length|cover|contain|initial|inherit;
}
//shorthand:
div {
  background: #ffffff url("img_tree.png") no-repeat right top;
}

Example 2: adding background image css

/* Answer to: "adding background image css" */

/*
  The background-image property sets one or more background images
  for an element.

  By default, a background-image is placed at the top-left corner
  of an element, and repeated both vertically and horizontally.

  Tip: The background of an element is the total size of the
  element, including padding and border (but not the margin).

  Tip: Always set a background-color to be used if the image is
  unavailable.
*/

/* Set a background-image for the <body> element: */

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

/* Set two background images for the <body> element: */

body {
  background-image: url("img_tree.gif"), url("paper.gif");
  background-color: #cccccc;
}

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Misc Example