.timeline {
  position: relative;
}
.timeline::before {
  content: '';
  background: #f5f5f5;
  width: 5px;
  height: 100%;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.timeline-item {
  width: 100%;
  margin-bottom: 60px;
}
.timeline-item:nth-child(even) .timeline-content {
  float: right;
}
.timeline-item:nth-child(even) .timeline-content .date {
  right: auto;
  left: 0;
}
.timeline-item:nth-child(even) .timeline-content::after {
  content: '';
  position: absolute;
  border-style: solid;
  width: 0;
  height: 0;
  top: 30px;
  left: -15px;
  border-width: 10px 15px 10px 0;
  border-color: transparent #f5f5f5 transparent transparent;
}
.timeline-item::after {
  content: '';
  display: block;
  clear: both;
}

.timeline-content {
  position: relative;
  width: calc( 50% - 30px );
  border-radius: 4px;
  background: #f5f5f5;
  box-shadow: 0 20px 25px -15px rgba(0, 0, 0, 0.3);
}
.timeline-content p {
  margin: 0;
  padding: 8px 24px 16px 24px;
}
.timeline-content::after {
  content: '';
  position: absolute;
  border-style: solid;
  width: 0;
  height: 0;
  top: 30px;
  right: -15px;
  border-width: 10px 0 10px 15px;
  border-color: transparent transparent transparent #f5f5f5;
}

.timeline-img {
  width: 100%;
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
}

.timeline-date {
  font-weight: 600;
  padding: 16px 24px 0 24px;
  margin-bottom: 8px;
}

@media screen and (max-width: 768px) {
  .timeline::before {
    left: 24px;
  }
  .timeline-item {
    margin-bottom: 40px;
  }
  .timeline .timeline-content {
    max-width: 100%;
    width: auto;
    margin-left: 56px;
  }
  .timeline .timeline-item:nth-child(even) .timeline-content {
    float: none;
  }
  .timeline .timeline-item:nth-child(odd) .timeline-content::after {
    content: '';
    position: absolute;
    border-style: solid;
    width: 0;
    height: 0;
    top: 30px;
    left: -15px;
    border-width: 10px 15px 10px 0;
    border-color: transparent #f5f5f5 transparent transparent;
  }
}