tabler/site/styles/_timeline.scss

.timeline {
  display: flex;
  flex-direction: column;
}

.timeline-summary {
  text-align: right;
}

.timeline-description {
  position: relative;
  padding-bottom: 5rem;

  &:before {
    content: "";
    position: absolute;
    left: 0;
    top: calc(1rem + 3px);
    bottom: calc(-1rem + 3px);
    width: 1px;
    background: $color-border;
  }

  &:after {
    content: "";
    position: absolute;
    left: -3px;
    top: calc(1rem - 3px);
    width: 7px;
    height: 7px;
    border: 1px solid $color-border;
    border-radius: 50%;
  }
}

.timeline-item {
  &:last-child {
    .timeline-description {
      padding-bottom: 0;

      &:before {
        bottom: 0;
        background: linear-gradient(to bottom, $color-border, $color-border 50%, transparent);
      }
    }
  }
}