* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
/*   outline: 1px solid #999; */
}


.timeline > h3 {
  text-align: center;
  text-transform: capitalize;
  font-size: 2rem;
  font-weight: bold;
  padding: 1rem;
}

.timeline > .column {
  display: flex;
  flex-direction: column;
  position: relative;
  margin: 1rem;
}

.timeline > .column::before {
  content: "";
  display: block;
  position: absolute;
  left: 50%;
  transform: translatex(-50%);
  border: 1px solid rgba(49, 49, 49, 0.5);
  height: calc(100% / 5 * 4);
  z-index: -1;
}

.timeline > .column > .row {
  display: flex;
}

/* row text */
.timeline > .column > .row > .text {
  flex: 1 1 calc(50% - 50px);
  position: relative;
  box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.175);
}
.timeline > .column > .row h3 {
  color: #fff;
  background-color: #4b4b4b;
  padding: 1rem;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
}

.timeline > .column > .row p {
  padding: 1rem;
  color: rgba(51, 51, 51, 0.5);
  border-bottom-left-radius: 5px;
  border-bottom-right-radius: 5px;
}

/* row icon */
.timeline > .column > .row > .icon {
  flex: 1 1 100px;
}

.timeline > .column > .row > .icon > div {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  margin: auto;
  background: #fff;
  box-shadow: 0 1rem 3rem rgb(0 0 0 / 18%);
  position: relative;
}

.timeline > .column > .row > div i {
  display: block;
  font-size: 1.5rem;
  color: rgb(0, 85, 255);
  text-align: center;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* row time */
.timeline > .column > .row > .time {
  flex: 1 1 calc(50% - 50px);
  padding-top: 1rem;
}

.timeline > .column > .row:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline > .column > .row:nth-child(even) > div:last-child {
  text-align: end;
}

.timeline > .column > .row:nth-child(even) h3::before {
  content: "";
  position: absolute;
  left: -20px;
  border: 10px solid rgba(0, 0, 0, 0);
  border-right-color: black;
}
.timeline > .column > .row:nth-child(odd) h3::after {
  content: "";
  position: absolute;
  right: -20px;
  border: 10px solid rgba(0, 0, 0, 0);
  border-left-color: black;
}


/* mobile version */
@media screen and (max-width: 768px) {
  .timeline > .column::before {
    left: 50px;
    height: calc(100% / 5 * 4);
    top: 50px;
  }

  .timeline > .column > .row {
    flex-flow: column wrap;
    height: 250px;
  }

  .timeline > .column > .row:nth-child(even) {
    flex-direction: column;
  }

  .timeline > .column > .row:nth-child(even) > .time:last-child {
    text-align: start;
  }

  .timeline > .column > .row > .icon {
    order: 1;
    flex: 1 1 100%;
    padding-top: 50px;
    width: 100px;
  }

  .timeline > .column > .row > .time {
    order: 2;
    flex: 1 1 50px;
    width: calc(100% - 100px);
  }

  .timeline > .column > .row > .text {
    order: 3;
    flex: 1 1 calc(100% - 50px);
    width: calc(100% - 100px);
  }

  .timeline > .column > .row:nth-child(odd) h3::before {
    content: "";
    position: absolute;
    left: -20px;
    border: 10px solid rgba(0, 0, 0, 0);
    border-right-color: black;
  }
  .timeline > .column > .row:nth-child(odd) h3::after {
    border: none;
  }
}