<body background = ""> code example
Example 1: css background image
background-image: url("image.png");
background-position: center;
background-repeat: no-repeat;
background-size: cover;
Example 2: 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>