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#game_play_button, #game_window > .game_circle { filter: drop-shadow(2px 2px 0 #222/*按鈕陰影顏色*/); }
.game_circle, #game_play_button:before { background-color:#666;/*按鈕顏色*/ }
.game_circle:before { background-color:#F99;/*亮起按鈕的圖案顏色*/ }
.game_circle[val="false"]:before { background-color:#BBB;/*未亮起按鈕的圖案顏色*/ }