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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
html,
body {
margin: 0;
width: 100%;
height: 100%;
overflow: hidden;
}
#container {
position: absolute;
width: 100vh;
height: 100vw;
overflow-x: hidden;
overflow-y: scroll;
transform: rotate(270deg) translateX(-100%);
transform-origin: top left;
}
#container > div {
height: 400vw;
background: linear-gradient(#eee, #999);
}
</style>
</head>
<body>
<div id="container">
<div></div>
</div>
</body>
</html>