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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
  margin: 0;
  font-size: 28px;
  font-family: Arial, Helvetica, sans-serif;
}
.header {
  background-color: #f1f1f1;
  padding: 30px;
  text-align: center;
}
#navbar {
  position: sticky;
  top: 0;
  overflow: hidden;
  background-color: #333;
}
#navbar a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}
#navbar a:hover {
  background-color: #ddd;
  color: black;
}
#navbar a.active {
  background-color: #04AA6D;
  color: white;
}
.content {
  padding: 16px;
}