a, a:visited, a:active {
    color: rgb(255, 255, 255);
  }
  
  .container {
    max-width: 900px;
    margin: auto;
  }
  
  .button {
    min-width: 130px;
    padding: 4px 5px;
    cursor: pointer;
    text-align: center;
    font-size: 13px;
    border: 1px solid #e0e0e0;
    text-decoration: none;
  }
  
  .button.active {
    background: #000;
    color: #fff;
  }
  
  #vis {
    width: 940px;
    height: 600px;
    clear: both;
    margin-bottom: 10px;
  }
  
  #toolbar {
    margin-top: 20px;
  }
  
  .year {
    font-size: 21px;
    fill: rgb(255, 255, 255);
    cursor: default;
  }
  .yearBegin {
    font-size: 21px;
    fill: rgb(255, 255, 255);
    cursor: default;
  }
  .tooltip {
      position: absolute;
      top: 100px;
      left: 100px;
    -moz-border-radius:5px;
      border-radius: 5px;
    border: 2px solid #000;
    background: #fff;
      opacity: .9;
    color: black;
      padding: 10px;
      width: 300px;
      font-size: 12px;
      z-index: 10;
  }
  
  .tooltip .title {
      font-size: 13px;
  }
  
  .tooltip .name {
    font-weight:bold;
  }
  
  .footer {
    text-align: center;
  }
  
  #bubble-title {
    color: var(--text_color);
    font-size: 13px;
    text-align: center;
    padding-top: 1em;
    margin-left: 18%;
  }