cover page - html injection below title / above body

Hi - I am trying to add simple formatted html text to appear in the body or just above the body text of a cover page.

I'd like this to be the first part of the body text:

<div style="padding: 15px; margin-bottom: 15px; background: #ffffde; border: 1px solid #ddd; width: 85%;" align="center">
<h1>IMPORTANT NOTICE</h1>

test text here  test text here test text here

<h3>test text here</h3>

</div>