I right-clicked it to load the frame in its own window without all the other stuff. This also fixed the centering problem, but you can also scroll horizontally to fix the centering.
Well, it's fixed now! And just looked at the other comments on what we're supposed to do...
The white words in the initial instructions has 0 contrast with the white ring around the center of the galaxy or whatever, and also low contrast with the bright text box, unfortunately.
Seems pretty clear instructions at least!