Make Paragraph Text Bigger on Single Post Only

Hi all,

I have what I hope is a simple question. Basically, I’m drafting a new Blog Post, but I want the paragraph text to be bigger than normal. I know you can change the text size for the whole site, but I want this change to be in a single post only.

Is this possible (in the script section at the bottom of the post, maybe?)

This is the link to my site >> turndogmillionaire.com << so you can see the theme and what not. I’m pretty sure this will be possible, but I’ve never done it before. Any help would be mucho appreciated ??

Cheers,
Matthew