how to put an image as a background for the body using css code example

Example 1: How to set a image as a backgroung image

<style>
body {
  background-image: url('img_girl.jpg');
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
}
</style>

Example 2: background image css

.selector {
  background-image: url(image.png);
}