The web page bobs around when pressing the buttons, when the game area is smaller than the window. Is there any way to make that stop aside from making the area smaller, so that it fits the window?
window.addEventListener("keydown", function(e) {
// space and arrow keys
if([32, 37, 38, 39, 40].indexOf(e.keyCode) > -1) {
e.preventDefault();
}
}, false);