   fill: white;
    }

    #scalar {
      flex-grow: 1;
      white-space: nowrap;
    }

    #histogram {
      flex-grow: 1;
    }

    #close_histogram svg line {
      stroke-width: 18;
      stroke: black;
    }
    #close_histogram:hover svg {
      background: black;
    }
    #close_histogram:hover svg line {
      stroke: white;
    }

    #overview_container {
      display: none;
    }
    </style>

    <div id="histogram_container">
      <span id="missing">(missing)</span>
      <span id="empt