How can i resize properly to all web screen of mobile device

What i want to make is
HTML simple quiz game.

My game is intended to be used by ONLY 'Mobile Web browser

Now i’m trying to solve resizing problem, because all mobile device has different screen.

Here is my sample link. just for resizing test.

some of web browser show it properly, Show all backgrond on its device.
but some of that doesn’t…just show part of it. how can i fix it?

the below screenshot is what i want to fix.

. how can i fix this?

I noticed that the native browser of samsung mobiles has some problems with screen resizing. Have you tried with chrome?

Ah… thanks for letting me know… i tried to fix this for a week…
it’s okay in chrome or else. thanks!