Manual Fix
We're not doing anything official about this, but if it really is an issue for you, you can do this manually.
Visit this page to install the "Stylebot" addon for Google Chrome.
Once installed, visit this page and click the "Install Style in Stylebot" button at the top of the page.
When installed, visit The Bell Tree and while the addon is enabled all of your font should be displayed at a normal size, in normal colours. Bare in mind when using this it also means you won't see any bigger font or any normal coloured font. Everything will be default size with default colour.
Thank you very, very much for this! I don't personally expect an official fix in the future since it can't really be controlled, but this is a huge help for lots of people.