Add it to your home screen. After that it opens like an app and works offline.
iOS (iPhone / iPad)
1. Tap the Share icon (the box with an arrow).
2. Scroll down and tap “Add to Home Screen”.
3. Rename the shortcut if you want.
4. Tap Add.
Android
1. Wait a few seconds. A banner may ask you to install the app. If it does not:
• Tap the three dots in the top-right corner.
• Tap “Install app” or “Add to Home screen”.
2. Confirm by tapping Install.