As I understand it, the CSS class "centered" of the Wikipedia page collides with the class "centered" of the Wikipedia Speedruns page, because the class is used on the Wikipedia content seen in the following image. At the same time, the class with the same name is used on Wikipedia Speedruns to probably display such a centered box.
There seems to be a conflict within CSS classes of wikispeedruns and the wikipedia page itself when playing in German language.
In the following GIF you can see that a small box in the center of the screen is constantly blocking the view:
Issue on the Wikipedia Speedrun Page
You can try yourself here https://wikispeedruns.com/play/quick_play?prompt_start=Deutschland&prompt_end=Niederlande&lang=de
As I understand it, the CSS class "centered" of the Wikipedia page collides with the class "centered" of the Wikipedia Speedruns page, because the class is used on the Wikipedia content seen in the following image. At the same time, the class with the same name is used on Wikipedia Speedruns to probably display such a centered box.
Wikipedia Page
Wikipedia Speedrun Page