<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Scroll Progress Indicator</title>
  <link rel="stylesheet" href="style.css" />
</head>
<body>
  <div id="progressBar" class="progress-bar"></div>
  <main class="content">
    <h1>Scroll Progress Indicator</h1>
    <p>Scroll down to watch the top bar fill up.</p>
    <section class="filler"></section>
    <section class="filler alt"></section>
    <section class="filler"></section>
    <section class="filler alt"></section>
  </main>
  <script src="script.js"></script>
</body>
</html>