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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style>
body {
width: 100%;
height: 100%;
}
div {
position: absolute;
height: 100px;
width: 500px;
}
#bottom {
bottom: 0px;
}
#vertical {
height: 100%;
}
#farbottom {
top: 2000px;
background: red;
}
#abovetop {
top: -123px;
}";
</style>
</head>
<body>
<div id="abovetop"></div>
<div id="vertical"></div>
<div id="top" class="class1 class2"></div>
<div id="bottom"></div>
<div id="farbottom"></div>
</body>
</html>