.timeline-wrapper {
  position: relative;
  overflow: hidden;
  height: 60px;           /* enough room for tick + text */
  width: 100%;
  margin: 2rem 0;
}

#timeline {
  position: absolute;
  top: 50%;
  left: 0;
  height: 1px;
  background-color: #333;
  transform: translateY(-50%);
  /* width will be set by JS */
}

.timeline-item {
	margin-top: 14px;
  position: absolute;
  top: 50%;
  opacity: 0;
  transform: translate(-50%, -50%);
  transition: opacity 0.4s ease;
}

.timeline-item::before {
  content: '';
  position: absolute;
  top: -5px;               /* half the tick height */
  left: 50%;
  width: 1px;
  height: 10px;
  background-color: #333;
  transform: translateX(-50%);
}

.timeline-item .year-label {
  margin-top: 8px;
  font-size: 0.8rem;
  color: #c4c6bd;
  text-align: center;
}