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<!DOCTYPE html>
<html>
<head>
<style>
body {
  background-color: yellow; 
  color: red;
}
</style>
</head>
<body>
<p>Click the button to display the style properties of this document.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementsByTagName("STYLE")[0];
  document.getElementById("demo").innerHTML = x.innerHTML;
}
</script>
</body>
</html>