If you want to really customize your site, you can use CSS to do it – but it’s a paid feature if you want to be able to change the CSS for your theme.
You can, however, use inline CSS to customize posts,
How did I do that? I used a <span> tag to style just a part of the post, using the code:
<span style="color: blue; font-size: 2em;">like this.</span>
Using inline styling, you can tweak single words or all whole posts to give them a distinct look. Happy coding!