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) Page_Alignment

Expected behaviour

For the purple block to touch the lower bound of the screen.

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