<!DOCTYPE html><head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0">

  <title>Music Demo</title>

  <script src="https://unpkg.com/@webcomponents/webcomponentsjs@^2.0.0/webcomponents-loader.js"></script>

  </head><custom-style>
    <style is="custom-style">

      body {
        margin: 0;
        font-family: 'Roboto', 'Noto', sans-serif;
        background-color: #eee;
      }

      app-box {
        position: fixed;
        top: 0;
