Using text-align: justify for questionable aesthetic purpose here really hurts readability, especially on a narrower viewport like the 1026px viewport of Safari with sidebar on an iPad Pro 12.9’’ (although it’s probably more of a problem of the four column layout on that specific narrow viewport; three should be better).

Made it 3, try again perhaps. Changing to text-align: left really destroys the aesthetic though.

It could probably be helped a bit by enabling auto hyphenation, but ultimately browsers aren't optimized for typesetting narrow columns of text