Style Update (Adding OpenDyslexic Font Support) (25 May 2026)
Posted: Mon May 25, 2026 10:30 am
An update to the site-wide style has been made. The main reason for this was to improve accessibility for members if they wish to use the latest OpenDyslexic font. We took this opportunity to update the default font for the website from Segoe UI to one of the modern geometrical sans-serif fonts: DM Sans; it felt appropriate to make use of a font that has been designed with a focus on mathematical symmetries as part of its aesthetics. On your Account page is the option to switch between DM Sans, OpenDyslexic, or the old Segoe UI, if you don't like change. It should be noted that in order to accommodate OpenDyslexic, some minor compromises on the generic style settings have been made which will result in certain elements appearing slightly different to how you might have previously recalled.
There has also been changes to way that the default light mode and dark mode is handled. In particular, there is the option on your Account page to switch between Light (Default), Dark, or System; the latter will adopt the preference of either your browser or your operating system. It was a difficult decision as to whether or not to make System the default setting. Even though many members prefer dark mode, the signature look of Project Euler is light mode. So it was felt that any changes to this should be a deliberate choice of the member. Having System as the default would mean that new members who prefer dark mode settings might never see our signature look.
Hopefully these changes shouldn't have any negative unintended consequences impacting site usability, but as always, please report any issues you notice.
There has also been changes to way that the default light mode and dark mode is handled. In particular, there is the option on your Account page to switch between Light (Default), Dark, or System; the latter will adopt the preference of either your browser or your operating system. It was a difficult decision as to whether or not to make System the default setting. Even though many members prefer dark mode, the signature look of Project Euler is light mode. So it was felt that any changes to this should be a deliberate choice of the member. Having System as the default would mean that new members who prefer dark mode settings might never see our signature look.
Hopefully these changes shouldn't have any negative unintended consequences impacting site usability, but as always, please report any issues you notice.