* {
	margin:0;
	padding:0;
	list-style:none;
}
#box {
	width:650px;
	height:400px;
	margin:50px auto;
	border:1px solid red;
	position:relative;
}
#content {
	width:650px;
	height:350px;
	position:relative;
	background-image:url("http://www.jq22.com/demo/cssjdt201909281110/images/t5.png");
	background-size:650px 350px;
}
#shadow {
	height:40px;
	width:40px;
	position:absolute;
	background-color:aliceblue;
	left:350px;
	top:50px;
}
#block {
	height:40px;
	width:40px;
	position:absolute;
	left:0;
	top:355px;
	background-image:url("http://www.jq22.com/demo/cssjdt201909281110/images/t5.png");
	background-size:650px 350px;
}
#tip {
	height:40px;
	width:40px; 
	position:absolute;
	left:0;
	top:50px;
	background:url("http://www.jq22.com/demo/cssjdt201909281110/images/t5.png") no-repeat -350px -50px;
	background-size:650px 350px;
}