There is some font inconsistency across different content types.
Some are set to use default browser sans-serif font, others default font of the website theme and some Droid Sans (CP).
So when being standalone - activities looks a bit inconsistent because a different font is used. I guess this can look ugly if someone's default font is some serif typeface like Times new roman.
Below is an example of how different activities look on h5p.org where both fonts are sans serif fonts