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<!DOCTYPE HTML>
<html><head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
.grid {
height: 60px;
border: 10px solid green;
position: relative;
font-size:12px;
}
span {
position: absolute;
background: lime;
border: 1px solid black;
box-sizing: border-box;
}
.a {
left: 40px;
width: 60px;
height: 40px;
}
.b {
left: 20px;
top: 40px;
width: 60px;
height: 20px;
}
.c {
left: 80px;
top: 40px;
width: 60px;
height: 20px;
}
.d {
left: 0px;
width: 20px;
height: 60px;
}
</style>
</head>
<body>
<div class=grid>
<span class="a">a</span>
<span class="b">b</span>
<span class="c">c</span>
<span class="d">d</span>
</div>
</body>
</html>