[Theme: Proper] slider not responsive

Hi all,

sorry to ask here but the theme support team hasn’t been able to come up with a solution for my issue (they’ve been real kind and they’re still trying, but it’s just not happening!). So I just thought to ask over here to see if anyone might have bumped into the issue before.

The issue is that the home slider image is not responsive.

I have tried out everything I could immagine (reinstall theme, deactivate plugins, reinstalling wp on the database, even create a new database) but nothing worked out.

Does anyone have any idea what could have gone wrong? (or likely, what I might have messed up with?)

the site is http://www.mattia.gallery

Thanks in advance!

Best,
Mattia