Page content bleeding past footer, dynamic resize?

Hey all im learning as i go with editing CSS and PHP and I’ve manage to put together a layout, looks fine on the main page, but I noticed the content is not stretching properly height wise when i goto click on the 3D gallery.

Here is the a link to the page that has the issue: https://www.idreamfx.com/wp/?page_id=36&album=1&gallery=2

as you can see its bleeding past the footer, and the content section is not resizing properly.

What steps do i take to allow it to be dynamically resized with the content in it?

Doing some searching i came across the code: but i’m not sure if how or rather, where to apply such a code or what it really does?