.timeline {
  position: relative;
  padding: 20px;
  list-style: none;
}

.timeline:before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 60px;
  width: 2px;
  background: #e9ecef;
}

.timeline-item {
  margin-bottom: 20px;
  position: relative;
}

.timeline-item:before {
  content: '';
  position: absolute;
  left: 30px;
  height: 20px;
  width: 20px;
  border-radius: 50%;
  background: #6c757d;
}

.timeline-content {
  margin-left: 80px;
  padding: 0 20px;
}

h1 {
  font-size: calc(16px + (24 - 16) * ((100vw - 400px) / (1600 - 400)));
}

h2 {
  font-size: calc(14px + (20 - 14) * ((100vw - 400px) / (1600 - 400)));
}

p {
  font-size: calc(12px + (16 - 12) * ((100vw - 400px) / (1600 - 400)));
}

/* Mobile-friendly adjustments */
@media screen and (max-width: 600px) {

  h1 {
    font-size: calc(16px + (20 - 16) * ((100vw - 320px) / (600 - 320)));
  }

  h2 {
    font-size: calc(14px + (18 - 14) * ((100vw - 320px) / (600 - 320)));
  }

  p {
    font-size: calc(12px + (14 - 12) * ((100vw - 320px) / (600 - 320)));
  }
}