Fix: Reliable cross-browser support

`textContent` is cross-browser and reliable, while `innerText` is not implemented everywhere (most notably in Gecko) and differs in browser implementation.
Merge pull request #1 from fbender/patch-1

Fix: Reliable cross-browser support
add link
fix css
fix bugs
fix bugs
add link to game
add link to game
Merge pull request #8 from danbender/link

Link