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<!DOCTYPE html>
<style>
@page {
size: 20in 3in;
margin: 0;
}
div {
position: absolute;
background: blue;
width: 20px;
height: 20px;
}
.upper {
top: 0;
}
.lower{
bottom: 0;
}
.left{
left: 0;
}
.right{
right: 0;
}
</style>
<body>
<div class="upper left"></div>
<div class="upper right"></div>
<div class="lower left"></div>
<div class="lower right"></div>
</body>