One-O-Eight is a multi-schemes syntax. It comes with two backgrounds (white on black or black on white), and a number of foreground schemes. All schemes are based on five colours; the name one-o-eight comes from 108°, the internal angles in a pentagon.
The schemes are:
gfmsupport, including tables and CriticMarkup
All screenshots use the free Hack font at 15pt, which is great. All variants use a palette with five colors, and each color has a lighter variant and a darker variant.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.