I loved the simplicity, and wanted to know how it was done.

https://github.com/asciimoo/cssplot/blob/master/cssplot.css

  .bar-chart ul li[data-cp-size="0"] {
  height: 0%;
  }
  .bar-chart ul li[data-cp-size="1"] {
  height: 1%;
  }
  .bar-chart ul li[data-cp-size="2"] {
  height: 2%;
  }
  ...

Still find it cool, but a 1200 line CSS may be a bit too much for a practical application.