How do I make html5 game for phone browser?

I would like to make games that can run from the Web browser of computers and phone browsers. I tested a demo game, exported to html5 and put it on a Web server. The game runs OK on the Web browser of computers. However, when I load the game from a smart phone, the game window is very small and not resize-able. If I rotate the phone, the size of the game window does not change.

So my question is how to make a full screen game or a resize-able game on phone browser?

Thanks!

Try different scaling options.

construct.net/en/tutorials/supporting-multiple-screen-sizes-77