You can try the new display: fullscreen
https://developers.google.com/web/updates/2017/04/nic58#fullscreen
When Progressive Web Apps are launched from the Android home screen, they launch in a standalone app-like mode that hides the omnibox. This helps create an engaging user experience, and frees up screen space for content.
However, for even more immersive experiences like games, video players, or other rich content, mobile UI elements such as the system bars can still be a distraction and take up valuable pixels that you may want.
Now you can make your Progressive Web App feel fully immersive by setting display: fullscreen in your web app manifest.
When your app is launched from the home screen, all non-app mobile UI elements will be hidden.