<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>無标題文檔</title>
</head>
<style type="text/css">
div{
border:#00F solid 3px;
height::100px;
width:200px;
}
#div_1{
background-color:#9F3;
float:left;
}
#div_2{
background-color:#F0F;
}
#div_3{
background-color:#FF0;
}
</style>
<body>
<div id="div_1">這是一個盒子1</div>
<div id="div_2">這是一個盒子2</div>
<div id="div_3">這是一個盒子3</div>
</body>
</html>