Default WordPress CSS Styling

I want to use as make default CSS styling as possible to keep everything clean. I have found most of the default settings, but I cannot find anything for the post CSS itself.

here is my index:

[code moderated - please use the pastebin - see forum guidelines]

here is my CSS so far:

.post {margin:0 0 10px 0; padding:0; border:1px solid #ccc}
.post h2 {background:blue;}
.post-meta {background:green;}

how can I style the actually text entry using default CSS? I do not want to throw another selector into my index.

Thanks!!!!!!!!!