.playground{ width: 525px; height: 550px;
	margin: 20px auto 0 auto;
	position: relative;
	background-image:url(../img/tetris.png);
}
.pause{width: 525px; height: 550px;
	position: absolute;
	top:0;left:0;
	background-image:url(../img/pause.png);
	z-index:100;
	display:none;
}
.playground img{position:absolute;z-index:10;}
.playground p{
	font-size: 30px;
	font-family: 'SimHei';
	font-weight: bold;
	color: #667799;
	position: absolute;
	left:305px;
	top:120px;
}
.playground p+p{top:176px;}
.playground p+p+p{top:232px;}