The page has no text for me (only the table of contents on the side, that updates by scrolling over the completely blank purple page …)

I'm using Firefox

Removing this:

  @layer base {
    :root, #nd-docs-layout {
      --fd-layout-offset: max(calc(50vw - var(--fd-layout-width)/2),0px);
    }
  }

EDIT: Oh, or making the window less than around 3000 px wide does also fix it, and resizing you can see what is happening there …