Examples of websites using
IBM Plex Mono
(IBM Plex Mono is a monospaced font designed by Mike Abbink of Bold Monday. The font is available in multiple styles, including regular, light, medium, semibold, bold, and extrabold)
with
Helvetica Neue
(Helvetica Neue is a popular Sans Serif font designed by Max Miedinger and published through Linotype in 1961. The font family consists of multiple styles with different weights and matching italics)