"after-dark" comes with some handy shortcodes to make your life easier and your posts more exciting.
Here are some examples:
GIF-Suport
Level up your posts with GIFs!
Fancy Notes
Note: Some really insightful note here.
$$ \sum_{i=1}^{n} i = \frac{n(n+1)}{2} $$
YouTube Video Embedding
Audio File Embedding
If you're still falling for this, I don't know what to tell you.