Hello everyone !
Hope everyone is healthy and safe. 

I've followed this great tutorial and I'm having a small (though important) issue. My website is not responsive to small devices... it just stays with the desktop layout. 
I've also downloaded the source code of the example and it has the same issue. 
Any leads on how to make it responsive ? Technically it should be automatic because of bootstrap but I can't find what's missing. 
Thanks in advance and stay safe!