body {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 13px;
    padding: 30px;
  }
  
  h1 {
    margin-top: 0;
  }
  
  #start-year-input {
    width: 60px;
  }
  
  .source {
    margin-top: 40px;
    font-size: 10px;
    color: #888;
  }
  .source a {
    color: #888;
  }
  
  /* Tooltip */
  .tooltip circle {
    fill: none;
    stroke: #78bd39;
  }
  .tooltip text {
    fill: #78bd39;
  }
  
  
  /* Axes */
  .axis line {
    fill: none;
    stroke: #8693a0;
    shape-rendering: crispEdges;
  }
  .axis text {
    font-size: 13px;
    fill: #6b6b6b;
  }
  .axis-title {
    font-size: 13px;
    fill: #888;
  }
  .x-axis .domain {
    stroke: #8693a0;
  }
  .y-axis .domain {
    display: none;
  }
  
  .chart-area {
    fill: #a5b3bf;
  }
  .chart-line {
    fill: none;
    stroke: #517390;
    stroke-width: 2px;
    clip-path: url(#clip);
  }