Hello, friends! After 10(!) years of #AdventOfCode, I've made some changes to preserve my sanity: there will be 12 days of puzzles each December (still starting Dec 1) and there is no longer a global leaderboard. Read more:
https://adventofcode.com/2025/about#faq_num_days
https://adventofcode.com/2025/about#faq_leaderboard
About - Advent of Code 2025

@ericwastl Is there a possibility to display your web-pages in 'light' mode?
@josyb Yes! There's an alternate stylesheet you can enable: https://adventofcode.com/2025/about#faq_highcontrast
About - Advent of Code 2025

@ericwastl Firefox? I am using Vivaldi :(
High Contrast? I am not blind - yet :)
Just straight light mode AKA non-dark mode please?

@josyb The high-contrast stylesheet is the closest I have to a dark-on-light mode. I've never used Vivaldi, but according to https://help.vivaldi.com/desktop/appearance-customization/extensions/ , you should be able to use https://chromewebstore.google.com/detail/stylish-custom-themes-for/fjnbnpbmkenffdnngjfgmeleoegfcffe?hl=en , which would let you apply a style like:

html,img{filter:invert(1) hue-rotate(180deg);}

...which isn't perfect, but would get you pretty close.

Using Extensions in Vivaldi | Vivaldi Browser Help

Vivaldi is compatible with most extensions available in the Chrome Web Store. Find out how to add and manage Extensions in Vivaldi.

Vivaldi Browser Help

@ericwastl Yes, that may work BUT only if you give them all your
data.

Can't you (just) add a dark/light setting to your web-source?

@ericwastl I found the `Reader View` button in Vivaldi:
and it applies your alternate high-contrast css indeed, But only the `About` page shows that reader icon. And the 'menu' gets lost.