Connect and cancel buttons not shown on mobile

[kf106]

Opening Prismarine web client in Chrome on an Android mobile phone doesn't show the connect and cancel buttons when joining a server (and hence you can't join the server)

Android 11, OnePlus DN2103, Chrome 101.0.4951.41

[zardoy]

I believe this is intentional as you need to go fullscreen first (hide address bar). The same thing applies to ios as well:

or you can install it as app

[zardoy]

Hey! It turns out there is no such button to hide address bar in chrome android, so the best solution I could think of is to add a button that goes to fullscreen:

Also I've removed any usages of absolutely positioning in favor of fixed so UI always stays on the screen even when browser UI is visible