Explicitly use an unambigious font for external key.

[threethan]

Is your feature request related to a problem? Please describe.
I am selling a small software utility on itch.io which uses 6-digit alphanumeric license keys.
I have had multiple issues where users cannot tell the difference between O and 0 or I and 1 in their external key.
This is because itch.io only specifies the font-family as "monospaced" - which is determined by the user's OS.

Describe the solution you'd like
Specific an unambiguous web font such as Sono or Roboto Mono

Describe alternatives you've considered
A more robust fallback with multiple specific fonts prioritized also "monospaced" would also work for most systems, but still ends up being OS-dependent.

Additional context
Windows screenshot using an unambiguous font:

Android screenshot using an ambiguous font:

These are of the same page, both on Chrome.