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<!doctype html>
<meta charset=utf-8>
<meta name="viewport" content="width=device-width">
<style>
body {
margin: 0;
}
.fixed {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 50px;
background-color: blue;
}
</style>
<div class="fixed"></div>