m 0.5em;
      }
      .contents table {
        border: 1px solid #ddd;
      }
      .contents th {
        background-color: #eee;
      }
      .contents th, .contents td {
        padding: 0.5em;
      }
      .contents pre {
        background-color: #f8f8f8;
        padding: 1em;
      }
      .contents h1:not(:first-child) {
        margin-top: 1.5em;
      }
      .contents h2 {
        margin-top: 1.5em;
      }
      .contents img {
        max-width: 90%;
      }
    </style>
  </head>
  <body>
