style.css

/* remove default margin and padding from body */
body {
    padding: 0;
    margin: 0;
  }
  
  /* set map, body, and html to 100% of the screen size */
  #mapid,
  body,
  html {
    height: 100%;
  }
  
  .legend {
    padding: 6px 8px;
    font: 12px Arial, Helvetica, sans-serif;
    font-weight: bold;
    color: #555;
    background: #fff;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 5px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
  }
  
  .legend ul {
    padding: 0;
    margin: 0;
    clear: both;
    list-style-type: none;
  }
  
  .legend li {
    display: inline-block;
    width: 30px;
    height: 22px;
  }
  
  .legend .min {
    float: left;
    padding-bottom: 5px;
  }
  
  .legend .max {
    float: right;
  }
  
  h1 {
    text-align: center;
  }

  .leaflet-bottom.leaflet-left{
    width: 100%;
  }
  .leaflet-control-container .leaflet-timeline-controls{
    box-sizing: border-box;
    width: 100%;
    margin: 0;
    margin-bottom: 15px;
  }