Several tutorial pages loading in light mode sometimes instead of (my system preferred) dark mode when performing actions

[summerowls0521]

I'm following along learning Svelte but it's a bit disconcerting that something as important as theming doesn't seem to be working properly in your educational course. I don't want my websites switching themes unpredictably. This bug has happened on numerous pages, I decided to report it on the latest one it's happened on. I'm going to assume it's something wrong with the tutorial rather than Svelte. It happened when I clicked the login button here:

https://svelte.dev/tutorial/kit/route-groups

[summerowls0521]

It also happens on this page when you enter the correct password:

https://svelte.dev/tutorial/kit/env-static-private

[eltigerchino]

also related #627