body { background-color: #eee; margin: 24px; }
h1 { color: red; }
#game-container { position: relative; }
#game { background-color: #ffd; }
#levels { display: none; position: absolute; left: 520px; top: 0px; }
#action-buttons { display: none;
                  width: 480px; background-color: #ddf; text-align: center; }
#action-buttons button { margin: 24px; }
#age-para { font-weight: bold; }