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<!DOCTYPE html>
<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<style>
html {
height: 100%;
width: 100%;
}
body {
margin: 0px;
padding: 0px;
}
div {
width: 20px;
height: 100vh;
position: absolute;
top: 0px;
background-color: darksalmon;
}
</style>
</head>
<body>
<div></div>
</body>
</html>