Fix: Catch error when running without Arduino

- App would exit upon missing a Serial connection

Signed-off-by: Eelke Feenstra <dev@eelke.net>
Add buttons according to design (distributed randomly)

- Add buttons (small and big)
- Scale viewport to desired size
- Prevent dragging of browser window

Signed-off-by: Eelke Feenstra <dev@eelke.net>
Fix margin on top

Also started using the Pronestor Kiosk Browser on the iPad, fullscreen safari without any distractions.

Signed-off-by: Eelke Feenstra <dev@eelke.net>
Add buttons as intended, using conversion table

Signed-off-by: Eelke Feenstra <dev@eelke.net>
Merge pull request #1 from eelke/master

Fix: Catch error when running without Arduino; Add buttons