title: When you click on the button, display a message
body: <p>There is a checkbox and a button. When you click the button, display the message "Thank you" if the checkbox is clicked. If the checkbox is not active, the message "Goodbye"</p>
  
  <pre><code>&lt;input  type="checkbox" id="checkBox"&gt;
  &lt;input type="button" id='button'&gt;
  </code></pre>