how to change the layout of cards

[menglunyang]

this game is awesome, I learn a lot from this. but now I want change the layout of cards. For example, you set level one 4 * 2. I want change it to 2 * 2. I modified some of files, but it didn't change. the following is what I did.
change _game.scss line 133-134

//$y : sqrt($tiles/2);
//$x : $tiles/$y;
$y : 2;
$x : 2;

could you tell me how to do?