Resized the in browser play screen

When the game in in full screen  mode this issue does not present itself but otherwise the shaped disappear off screen and the only way to get them back is to reset the entire game using the rest button which is undesirable if you are in the middle of creating something you don't wan to lose. In light of this I resized the playable area to stop this problem, it has made the text appear squashed in full screen mode though unfortunately.