jrtechs-vis/lib/timeline/component/css/itemset.css

.vis.timeline .itemset {
  position: relative;
  padding: 0;
  margin: 0;

  box-sizing: border-box;
}

.vis.timeline .itemset .background,
.vis.timeline .itemset .foreground {
  position: absolute;
  width: 100%;
  height: 100%;
}

.vis.timeline .axis {
  position: absolute;
  width: 100%;
  height: 0;
  left: 1px;
  z-index: 1;
}

.vis.timeline  .foreground .group {
  position: relative;
  box-sizing: border-box;
  border-bottom: 1px solid #bfbfbf;
}

.vis.timeline  .foreground .group:last-child {
  border-bottom: none;
}