<body >
	<div id="div1" >가나다</div>
	<div id="div2">가나다</div>
	<div id="div3">가나다</div>
	<div id="div4">가나다</div>
	<div id="div5">가나다</div>
	<div id="div6">가나다</div>
	<div id="div7">가나다</div>

</body>
body > div {
  margin-top : 20px;
	margin-bottom : 20px;
}

#div1{background:#ff0000}
#div2{background:#FF6600}
#div3{background:#FFFF00}
#div4{background:#00CC00}
#div5{background:#0033FF}
#div6{background:#003399}
#div7{background:#9933FF}
Rerun