::: {.important-box}
Seriously, this is important.
:::
::: {.warning-box}
Maybe pay attention to this.
:::
::: {.note-box}
It’s only champagne if it's from the Champagne region of France. Otherwise, it's just
sparkling wine.
:::
::: {.dangerous-box}
What happens when you mix matter and anti-matter.
:::
::: {.mathy-box}
You were warned about measure theory. Now you have to read about it.
:::
Extending #4