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<!DOCTYPE html>
<style>
body {
margin: 0;
}
.a {
position: absolute;
left: 0;
top: 0;
width: 100px;
height: 30px;
background-color: green;
}
.b {
position: absolute;
left: 40px;
top: 40px;
width: 30px;
height: 100px;
background-color: green;
}
</style>
<div class="a"></div>
<div class="b"></div>