tour.golang.org : unreadable source code on phone

[Konstantin8105]

What did you do?

Open web page https://tour.golang.org/flowcontrol/8 on phone

What did you expect to see?

readable source code.

[ALTree]

Thanks for the report.

This is golang/tour#295, reported in the tour issue tracker, so I'm closing this issue as a duplicate of that one.