* {
	margin:0;
	padding:0;
	list-style:none;
}
#box {
	width:200px;
	height:200px;
	border:2px solid red;
	margin:50px auto;
	border-radius:100px;
	position:relative;
}
/*#s {
	width:30px;
	height:30px;
	background:red;
	position:absolute;
	top:0;
	margin-top:-15px;
	left:50%;
	margin-left:-15px;
	border-radius:50%;
}
*/
        span {
	width:30px;
	height:30px;
	background:red;
	position:absolute;
	top:0;
	margin-top:-15px;
	left:50%;
	margin-left:-15px;
	border-radius:50%;
}