Horizontal pages should display with correct width#240

Current behaviour:
Horizontal pages display with width of 498px.

Expected behaviour:
Horizontal pages should show with correct width (typically 625px).

Example page:
https://youneedawiki.com/app/page/1qtLZP6XSTTsJQJdcXzKNiWTcSviWAUnuAwE3LLQFyYU?p=1KVjpqsTJ1un79FChj4QE2coy4FZi0q5M