How to hide elements with the 'custom styles' feature?

Hi guys, I'm trying to hide the left nav with the use of the 'custom styles' feature in the admin panel, what would be the proper way to do it?

I tried adding nav.IndexPage-nav.sideNav {display: none;} but it didn't work ?

Hmm, seems that I can't change the title, it should be 'custom' instead of 'costum' ofcourse ?

Strange idea to hide the main navigation ?

Anyway, your code nav.IndexPage-nav.sideNav {display: none;} works on my forum.

Try clearing the cache with php flarum cache:clear and hard-refresh your browser with CTRL+F5 to make sure you are using the latest style version.