Is there a problem with the site? Can't go to next tutorial/pages cut off

Is there a problem with the site? Can't go to next tutorial/pages cut off
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#1

I’ve just started the very first tutorial. I can’t find any “next” button to go to the next lesson. If I choose a new tutorial from the “map” menu, half of the page is cut off on some of them. Is there a problem with the site? I’ve tried 3 different browsers.