*{margin:0;padding:0;box-sizing:border-box}
body{
    background:#222;
    color:#fff;
    font-family:微软雅黑;
    padding:30px;
}
.game{
    max-width:600px;
    margin:0 auto;
}
.info{
    font-size:20px;
    margin-bottom:10px;
}
#gameBox{
    width:600px;
    height:320px;
    background:#333;
    border:2px solid orange;
    position:relative;
    overflow:hidden;
    margin-bottom:15px;
}
#player{
    position:absolute;
    left:80px;
    bottom:30px;
    font-size:24px;
    color:#ff7700;
}
#monster{
    position:absolute;
    right:80px;
    bottom:30px;
    font-size:24px;
    color:#f33;
}
.btn-group button{
    padding:12px 24px;
    font-size:18px;
    background:#ff6600;
    border:none;
    color:white;
    border-radius:8px;
    margin-right:10px;
    cursor:pointer;
}
.btn-group button:hover{
    background:#ff8833;
}