delonnewman/dragnet

.sparkline {
  display: inline-block;
  height: 1em;
  margin: 0 0.5em;
  transition: all .5s ease;
}

.sparkline .index {
  position: relative;
  float: left;
  width: 3px;
  height: 100%;
  margin-right: 2px;
}

.sparkline .index .count {
  display: block;
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 0;
  font: 0/0 a;
  text-shadow: none;
  color: transparent;
  background: green;
  border-radius: 20%;
}