انها محاولة لنفسك - CSS Reference background-position

<!DOCTYPE html>
<html>
<head>
<style>
body {
   background-image: url('smiley.gif');
   background-repeat: no-repeat;
   background-attachment: fixed;
   background-position: 50px 100px;
}
</style>
</head>

<body>
</body>

</html>