.main-timeline {
  position: relative;
}

.main-timeline::after {
  content: '';
  position: absolute;
  width: 6px;
  background-color: #939597;
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -3px;
}

.timeline {
  position: relative;
  background-color: inherit;
  width: 50%;
}

.timeline::after {
  content: '';
  position: absolute;
  width: 25px;
  height: 25px;
  right: -13px;
  background-color: #939597;
  border: 5px solid #f5df4d;
  top: 15px;
  border-radius: 50%;
  z-index: 1;
}

.left {
  padding: 0px 40px 20px 0px;
  left: 0;
}

.right {
  padding: 0px 0px 20px 40px;
  left: 50%;
}

.left::before {
  content: " ";
  position: absolute;
  top: 18px;
  z-index: 1;
  right: 30px;
  border: medium solid white;
  border-width: 10px 0 10px 10px;
  border-color: transparent transparent transparent white;
}

.right::before {
  content: " ";
  position: absolute;
  top: 18px;
  z-index: 1;
  left: 30px;
  border: medium solid white;
  border-width: 10px 10px 10px 0;
  border-color: transparent white transparent transparent;
}

.right::after {
  left: -12px;
}

.card {
  padding: 0px 30px;
  position: relative;
  border-radius: 6px;
  box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
}

@media screen and (max-width: 600px) {
  .main-timeline::after {
    left: 31px;
  }
  
  .timeline {
    width: 100%;
    padding-left: 70px;
    padding-right: 25px;
  }
  
  .timeline::before {
    left: 60px;
    border: medium solid white;
    border-width: 10px 10px 10px 0;
    border-color: transparent white transparent transparent;
  }

  .left::after, .right::after {
    left: 18px;
  }
  
  .left::before {
    right: auto;
  }

  .right {
    left: 0%;
  }
}