No, that's normal, your content is wider than the viewport, that's why I (deliberately) made the screen smaller (to make a scrollbar appear). It doesn't show much empty space, like in your screenshot. Maybe the scrollbar style confuses you, but it's scrolled all way to the right. There's nothing more to the right of it, and just the content to the left of it. Whereas in your screenshot, there's an awful lot of blue on the right of the content, and you've not even scrolled all way to the right yet.