.main-timeline {
  overflow: hidden;
  position: relative;
}

.main-timeline:before {
  content: "";
  width: 3px;
  height: 100%;
  background: #d6d5d5;
  position: absolute;
  top: 0;
  left: 50%;
}

.main-timeline .timeline {
  padding-right: 30px;
  position: relative;
}

.main-timeline .timeline:before,
.main-timeline .timeline:after {
  content: "";
  display: block;
  width: 100%;
  clear: both;
}

.main-timeline .timeline:first-child:before,
.main-timeline .timeline:last-child:before {
  content: "";
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 2px solid #d6d5d5;
  background: #fff;
  margin: 0 auto;
  position: absolute;
  top: 0;
  left: 0;
  right: -3px;
}

.main-timeline .timeline:last-child:before {
  top: auto;
  bottom: 0;
}

.main-timeline .timeline-icon {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid #d6d5d5;
  -webkit-box-sizing: content-box;
          box-sizing: content-box;
  margin: auto;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: -4px;
}

.main-timeline .timeline-icon:before {
  content: "";
  display: block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #737ab4;
  margin: auto;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}

.main-timeline .year {
  display: inline-block;
  padding: 8px 20px;
  margin: 0;
  font-size: 14px;
  color: #fff;
  background: #737ab4;
  text-align: center;
  position: absolute;
  top: 50%;
  right: 35%;
  -webkit-transform: translateY(-50%);
          transform: translateY(-50%);
}

.main-timeline .year:before {
  content: "";
  border-right: 18px solid #737ab4;
  border-top: 18px solid transparent;
  border-bottom: 18px solid transparent;
  position: absolute;
  top: 0;
  left: -18px;
}

.main-timeline .timeline-content {
  width: 46.5%;
  padding: 43px 50px;
  margin: 0 20px 0 0;
  background: #f2f2f2;
  position: relative;
}

.main-timeline .timeline-content:after {
  content: "";
  border-left: 20px solid #f2f2f2;
  border-top: 20px solid transparent;
  border-bottom: 20px solid transparent;
  position: absolute;
  top: 50%;
  right: -20px;
  -webkit-transform: translateY(-50%);
          transform: translateY(-50%);
}

.main-timeline .title {
  float: left;
  font-size: 24px;
  font-weight: bold;
  color: #504f54;
  margin: 0 20px 20px 0;
}

.main-timeline .post {
  display: inline-block;
  font-size: 14px;
  color: #999;
  margin-top: 6px;
}

.main-timeline .description {
  font-size: 14px;
  color: #7d7b7b;
  line-height: 24px;
  margin: 0;
  clear: both;
}

.main-timeline .timeline:nth-child(2n) {
  padding: 0 0 0 30px;
}

.main-timeline .timeline:nth-child(2n) .year {
  right: auto;
  left: 35%;
}

.main-timeline .timeline:nth-child(2n) .year:before {
  border: 18px solid transparent;
  border-right: none;
  border-left: 18px solid #737ab4;
  left: auto;
  right: -18px;
}

.main-timeline .timeline:nth-child(2n) .timeline-content {
  float: right;
  margin: 0 0 0 20px;
}

.main-timeline .timeline:nth-child(2n) .timeline-content:after {
  border-left: none;
  border-right: 20px solid #f2f2f2;
  right: auto;
  left: -20px;
}

@media only screen and (max-width: 1200px) {
  .main-timeline .year {
    right: 30%;
  }
  .main-timeline .timeline:nth-child(2n) .year {
    left: 30%;
  }
}

@media only screen and (max-width: 990px) {
  .main-timeline .year {
    right: 25%;
  }
  .main-timeline .timeline:nth-child(2n) .year {
    left: 25%;
  }
}

@media only screen and (max-width: 767px) {
  .main-timeline:before {
    left: 10px;
  }
  .main-timeline .timeline {
    padding: 0 0 0 30px;
    margin-bottom: 20px;
  }
  .main-timeline .timeline:last-child {
    margin-bottom: 0;
  }
  .main-timeline .timeline:first-child:before,
  .main-timeline .timeline:last-child:before {
    display: none;
  }
  .main-timeline .timeline-icon {
    margin: 0;
    position: absolute;
    top: 7px;
    left: 0;
  }
  .main-timeline .year,
  .main-timeline .timeline:nth-child(2n) .year {
    display: block;
    font-weight: bold;
    margin: 0 0 32px 30px;
    z-index: 1;
    position: relative;
    top: auto;
    left: auto;
    right: auto;
    -webkit-transform: none;
            transform: none;
  }
  .main-timeline .timeline:nth-child(2n) .year:before {
    border-left: none;
    border-right: 18px solid #737ab4;
    right: auto;
    left: -18px;
  }
  .main-timeline .timeline-content {
    padding: 20px;
  }
  .main-timeline .timeline-content,
  .main-timeline .timeline:nth-child(2n) .timeline-content {
    width: auto;
    float: none;
    margin: 0 0 0 30px;
  }
  .main-timeline .timeline-content:after,
  .main-timeline .timeline:nth-child(2n) .timeline-content:after {
    border: none;
    border-bottom: 20px solid #f2f2f2;
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
    top: -20px;
    left: 50%;
    right: auto;
    -webkit-transform: translateX(-50%);
            transform: translateX(-50%);
  }
}

@media only screen and (max-width: 480px) {
  .main-timeline .title {
    float: none;
    margin: 0;
  }
  .main-timeline .year,
  .main-timeline .timeline:nth-child(2n) .year {
    margin-left: 20px;
  }
  .main-timeline .timeline-content,
  .main-timeline .timeline:nth-child(2n) .timeline-content {
    margin-left: 10px;
  }
  .main-timeline .post {
    margin: 5px 0;
  }
}