added background gradient
Revert "added background gradient"

This reverts commit b87b35ff18803875a01fbfbb2159dff6c4776fc4.
Revert "Revert "added background gradient""

This reverts commit 7360449b5a6c34c9c86e144fa1c14d31b9807161.
fixed dumb mistake
added gradient background
Merge branch 'master' into gh-pages
replaced index.html with game.html, deleted game.html