<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.vl {
border-left: 6px solid green;
height: 500px;
position: absolute;
left: 50%;
margin-left: -3px;
top: 0;
}
</style>
</head>
<body>
<h2>Vertical Line</h2>
<div class="vl"></div>
</body>
</html>
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