Content div wont expand with more posts

Heya, im starting up a site over at https://www.projectlightstyle.com

Im having some issues getting my div that wraps around my content to expand when there is more content within it.

My code look like this:
[Code moderated as per the Forum Rules. Please use the pastebin]

My CSS looks like this:

[CSS moderated as per the Forum Rules. Please just post a link to your site.]

Ive minimalized all it puts out to try and figure out my issue so far, and i just cant figure it out.

If you require any further data please dont hesitate to ask and ill post it.

Thanks