Background image full size

<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
<style>
body {  background: url('Charlie.png'); background-attachment: fixed;
         background-size:100% 100%;  }
</style>
</head>
<body>

       <!  1st: create a folder / 2nd:   image goes in the folder   /  3rd  save html document inside the folder  >

<script>

</script>
</body>
</html>