Internal Web Browser on SQL lesson

[Cykotech]

https://www.codecademy.com/journeys/full-stack-engineer/paths/fscj-22-back-end-development/tracks/fscj-22-working-with-databases/modules/wdcp-22-multiple-tables-06900e20-1804-4272-820c-9ff9a11a7740/lessons/multiple-tables/exercises/what-is-join

[Jamesllllllllll]

Thanks @Cykotech !

Coincidentally, I deployed a new version that uses a lighter purple background. Commit 200b181

The Firefox extension is usually approved within a few hours, so you should see a new version in your browser today.

It's not the best contrast, but I didn't want to mess with the iframe's browser text color, since that would interfere with people doing HTML & CSS lessons.