nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqp77whr3cyukyulgej4qxyeee6gjxexumj4lsh9a40x0q4g5t72sqgfzmk4
I just tested with the default modern.css style file and the error is replicated.
So...
That's strange. I have no idea about why it may happen, you probably have to report it to the author of modern.css
CC: @OCTADE
CC: @OCTADE