.mb-10{margin-bottom:10px}.font-18{font-size:18px}.game-wrap{width:100%;padding-top:50px;margin:0 auto}.snake-box{float:left;width:80%;height:500px;background-color:#666}.right-operate{float:left;width:20%;padding:20px;background-color:#ccc}.right-operate .btn{display:block;width:100%;text-align:center}