Hi,
Setting the heights of "html" and "body" to 100vh solves the issue.
<!DOCTYPE html>
<html style="margin:0; padding:0; height:100vh;">
	<head>
		<title>Test Page!</title>
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
	</head>
	<body style="margin:0; padding:0; height:100vh;">
		<div id="Layout1" style="border-width:0px; height:100%; width:100%; background-color:red;">Rotate me</div>
	</body>
</html>
arafath_mk
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