Added "post" class

You can style anything that belongs to a whole post in this class, while dealing with smaller things like fonts in more specific tags.
fixed a styling issue

It was ".post{" instead of ".post {"
Added div tag with a post class around the post to make border look better.
Fixed a few typos and updated some sentences.
Merge pull request #3 from John95/master

Some slight aesthetic modifications [Wrongly formatted]