Getting `Unrecoverable Hydration Mismatch` error when there shouldn't be one

[Nikita]

Repo with code: https://github.com/Kisuyo/todo

What I did was create this component: https://github.com/Kisuyo/todo/blob/master/src/components/HamburgerMenu.tsx

And then try use it: https://github.com/Kisuyo/todo/blob/master/src/routes/index.tsx#L42

I get this error:

Not sure how to read it to fix it.

[Nikita]

Some more detail, this error happens when you first load the page. If you press Clear errors and retry button, the styles do get applied.