body {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 13px;
    padding: 30px;
  }
  
  h1 {
    margin-top: 0;
    font-size: 1.2rem;
  }
  
  .source {
    font-size: 10px;
    color: #888;
  }
  .source a {
    color: #888;
  }
  
  line {
    stroke: #ddd;
  }