Page Alignment incorrect
One-sentence description
The bottom does not reach the bottom of the screen at some pages.
Current behaviour / Reproducing the bug
When, for instance, on this page;https://thalia.nu/education/courses/72/
You can see that the purple block at the bottom does not reach the bottom of your screen (unless your screen is smaller)
Expected behaviour
For the purple block to touch the lower bound of the screen.