Set as block of text by light gray background

To set block of text in separate background.

Use the below code

<div style="background-color:#f0f0f3;padding:0.8em;">
Your block of Text here
Your block of Text here
Your block of Text here
Your block of Text here
</div>

It will perceive as a separate note or block like this

Your block of Text here
Your block of Text here
Your block of Text here
Your block of Text here