Add HTML for custom entry message boxes.

sample.html

<p class="message green">This is an example of custom message, which is easy to implement and can be used to put emphasis on a particular thought or sentiment. <a href="#">Click here for more</a>.</p>
<p class="message orange">This is an example of custom message, which is easy to implement and can be used to put emphasis on a particular thought or sentiment. <a href="#">Click here for more</a>.</p>
<p class="message red">This is an example of custom message, which is easy to implement and can be used to put emphasis on a particular thought or sentiment. <a href="#">Click here for more</a>.</p>