If you want something to stand out or just to break up the monotony of a wall of text you can use a shadow box!

I am in a shadow box

In your Canvas page, go to Edit, then HTML Editor and paste in:

<div style="margin: 50px 15% 50px 15%; background-color: #cccccc;">
<div style="position: relative; top: -20px; left: -20px; padding: 20px; background: #ffffff; border: 2px solid #cccccc;"><p>Enter Your Text Here</p></div></div>

Then switch back to "Rich Text Editor" and type your text into the box.

- background-color: #cccccc this is the "shadow colour"
- this is the colour of the box containing text
- solid #cccccc this is the thin border colour (best to make this the same as the shadow)