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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
html,
body {
margin: 0;
width: 100%;
height: 100%;
overflow: hidden;
}
#frame-wrapper {
position: absolute;
left: 0;
top: 0;
width: 100vh;
height: 100vw;
transform: rotate(90deg) translateY(-100%);
transform-origin: top left;
}
#oopif {
display: block;
width: 100%;
height: 100%;
border: 0;
}
</style>
</head>
<body>
<div id="frame-wrapper">
<iframe id="oopif"></iframe>
</div>
</body>
</html>