Mobile friendly layout

[sabi0]

The game board rendering on a mobile phone screen is rather tiny.
To the point where it's difficult to read the word cells, let alone the scores or buttons:

Turning the phone horizontally I can only fit 3 rows on the screen:

So I have to scroll up and down all the time (increasing the risk to accidentally tap a word by mistake).

It would be great if the game detected the screen size (using CSS "media" selectors) and adjusted the layout for better readability.

P.S. 5 x 5 board is not the most flexible option wrt layout change. 6 x 4 board could also be rendered as 4 x 6, 3 x 8 or even 2 x 12 depending on the screen size.