To set the scrolling of an image in the background, use the background-attachment property.
Example
You can try to run the following code to learn how to work with the background-attachment property:
<!DOCTYPE html>
<html>
<head>
<style>
body {
background-image: url('/css/images/css.jpg');
background-repeat: no-repeat;
background-attachment: fixed;
background-attachment:scroll;
}.
</style>
</head>
<body>
<p>The background-image is fixed. Try to scroll down the page.</p>
<p>The background-image is fixed. Try to scroll down the page.</p>
<p>The background-image is fixed. Try to scroll down the page.</p>
<p>The background-image is fixed. Try to scroll down the page.</p>
<p>The background-image is fixed. Try to scroll down the page.</p>
<p>The background-image is fixed. Try to scroll down the page.</p>
<p>The background-image is fixed. Try to scroll down the page.</p>
<p>The background-image is fixed. Try to scroll down the page.</p>
<p>The background-image is fixed. Try to scroll down the page.</p>
</body>
</html>