section#section-timeline {
  padding: 100px 0;
}

@media (min-width:768px) {
  section#section-timeline {
    padding: 150px 0;
  }
}

.timeline {
  list-style: none;
  padding: 0;
  position: relative;
}

.timeline:before {
  top: 0;
  bottom: 0;
  position: absolute;
  content: "";
  width: 2px;
  background-color: #f1f1f1;
  left: 40px;
  margin-left: -1.5px;
}

@media (min-width:768px) {
  .timeline:before {
    left: 50%;
  }
}