*{
  /*去除内外边距*/
  margin:0;
  padding:0;
}
/*整体框架样式*/
.container {
  width:600px;
  height:600px;
  background:#225675;
  border:20px solid #7dd9ff;
  margin:20px auto;
  display:flex;
  justify-content:center;
  align-items:center;
  position:relative;
}

.title{
  margin: 10px auto;
  display:flex;
  justify-content:center;
  align-items:center;
  position:relative;  
  font-size:25px;
  color:#ff0000;
}

/*按钮公共样式*/
.container button{
  border:none;
  outline:none;
}

/*开始按钮样式*/
.startBtn{
  width:200px;
  height:60px;
  background:url(../img/startGame.png) center/contain no-repeat; 
  display:block;
}

/*暂停按钮样式*/
.pauseBtn{
  width:60px;
  height:60px;
  background:url(../img/start.png) center/contain no-repeat; 
  display:none;
}