.timeline {
  position: relative;
  margin: 0 auto;
  padding: 20px 0;
  width: 100%;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 4px;
  background: #dee2e6;
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin: 20px 0;
  width: 50%;
  padding: 10px 20px;
}

.timeline-item-left {
  left: 0;
}

.timeline-item-right {
  left: 50%;
}

.timeline-item::before {
  content: "";
  position: absolute;
  top: 20px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 3px solid white;
  z-index: 1;
}

.timeline-item-left::before {
  right: -10px;
}

.timeline-item-right::before {
  left: -10px;
}

.timeline-item.latest::before {
  background: red;
}

.timeline-item:not(.latest)::before {
  background: gray;
}

.timeline-item .card {
  border-left: 4px solid #dee2e6;
}

.timeline-item.latest .card {
  border-left-color: red;
}