/* position: relative; 기준점을 잡아주고 난 이후  position: absolute; 위치를 잡으며 위치 설정을 하면 된다*/ 
#header{
	width:700px;
	height:400px;
	margin: 100px auto;
	background: #c926ff;
	position: relative;	
}


#box{
	width:100px;
	height:100px;
	background: #ff5533;
	position: absolute;
	top: -50px;
}

#box2{
	width:100px;
	height:100px;
	background: blue;
	position: absolute;
	top: 0;
	left: 0;
}

#box3{
	width:100px;
	height:100px;
	position: absolute;
	background: green;
	top: 100px;
}