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<!DOCTYPE HTML>
<!--
Any copyright is dedicated to the Public Domain.
-->
<html><head>
<meta charset="utf-8">
<style type="text/css">
html,body {
color:black; background-color:white; font:16px/1 monospace; padding:0; margin:0;
}
.container {
display: grid;
grid: 250px / 500px;
border: 3px solid;
width: 500px;
}
.responsive-container {
background: lightgrey;
}
</style>
</head>
<body>
<div class="container">
<div class="responsive-container"></div>
</div>
</body>
</html>