Add Click Events with JavaScript using the onclick property

What is your hint or solution suggestion?
In this problem to add click function to a HTML element using JavaScript add in document.addEventListener an event DOMContentLoaded which loads the event on your click once the DOM elements have finished loading,further add a function inside the addEventListener method which selects a HTML element by its ID i.e. getMessage and add onClick event to it which contains the function that we want to call using the click event.

<script>
  document.addEventListener('DOMContentLoaded', function(){
    // Add your code below this line
document.getElementById('getMessage').onclick=function(){};
    // Add your code above this line
  });
</script>

<style>
  body {
    text-align: center;
    font-family: "Helvetica", sans-serif;
  }
  h1 {
    font-size: 2em;
    font-weight: bold;
  }
  .box {
    border-radius: 5px;
    background-color: #eee;
    padding: 20px 5px;
  }
  button {
    color: white;
    background-color: #4791d0;
    border-radius: 5px;
    border: 1px solid #4791d0;
    padding: 5px 10px 8px 10px;
  }
  button:hover {
    background-color: #0F5897;
    border: 1px solid #0F5897;
  }
</style>
<h1>Cat Photo Finder</h1>
<p class="message box">
  The message will go here
</p>
<p>
  <button id="getMessage">
    Get Message
  </button>
</p>

Challenge: Handle Click Events with JavaScript using the onclick property

Link to the challenge: