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<!DOCTYPE html>
<html>
<style>
div {
  background-image: url('smiley.gif');
  background-repeat: no-repeat;
  width: 400px;
  height: 400px;
  border: 1px solid #000000;
}
</style>
<body>
<h1>HTML Style Object</h1>
<h2>The backgroundPosition Property</h2>
<button type="button" onclick="myFunction()">Position background image</button>
<br>
<div id="myDiv">
</div>
<script>
function myFunction() {
  document.getElementById("myDiv").style.backgroundPosition = "center bottom";  
}
</script>
</body>
</html>