How to do annotation/call out in CSS/HTML

I'm trying to figure out how to do something and I haven't seen any good examples. Within an article, there will be 3-5 key points (a sentence or two each). I want to call out those points as the reader is reading through the article. So, the points will probably look different than the rest of the article. I'm not quite sure how to make this look good using HTML/CSS. If you have seen an example on the web please post a link or if you know of a good way to do this please let me know….

How to do annotation/call out in CSS/HTML