<!DOCTYPE html>
<html>
  <head>
    <style type="text/css" media="screen">
      .container {
        margin: 10px auto;
        max-width: 600px;
        text-align: center;
      }
      h1 {
        margin: 30px 0;
        font-size: 3em;
        line-height: 1;
        letter-spacing: -1px;
      }
      audio {
        width: 100%;
      }
      .block {
        margin: 20px auto;
        border-bottom: solid gray;
      }
    </style>
  </head>
  <body>
    <div class="contain