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Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>
#myDiv {
    border: 1px solid #FF0000;
}
</style>
</head>
<body>

<div id="myDiv" style="padding-bottom:5cm;">This is a div.</div>
<br>
<button type="button" onclick="myFunction()">Return bottom padding</button>

<script>
function myFunction() {
    alert(document.getElementById("myDiv").style.paddingBottom);
}
</script>

</body>
</html>