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

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

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

.main-timeline .timeline:before{
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  margin: auto;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: 2;
}

.main-timeline .timeline-icon{
  width: 16px;
  height: 95%;
  background: #029bbd;
  margin: auto;
  position: absolute;
  top: 5%;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: 1;
}

.main-timeline .timeline-icon:before,
.main-timeline .timeline-icon:after{
  content: "";
  border-bottom: 11px solid #029bbd;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  position: absolute;
  top: -11px;
  left: 0;
}

.main-timeline .timeline-icon:after{
  border-bottom-color: #fff;
  top: auto;
  bottom: 0;
}

.main-timeline .year{
  display: inline-block;
  padding: 5px 35px;
  margin: 0;
  border-radius: 4px;
  font-size: 26px;
  color: #fff;
  background: linear-gradient(to right, #079dc0, #01c2bf);
  text-align: center;
  position: absolute;
  top: 50%;
  left: 25%;
  transform: translateY(-50%);
}

.main-timeline .timeline-content{
  width: 50%;
  float: right;
  padding: 0 60px 30px 60px;
  position: relative;
}

.main-timeline .icon{
  display: inline-block;
  font-size: 40px;
  color: #a7a7a7;
  margin-bottom: 7px;
}

.main-timeline .title{
  font-size: 20px;
  font-weight: bold;
  color: #a7a7a7;
  margin: 0 0 7px 0;
}

.main-timeline .description{
  font-size: 14px;
  color: #a7a7a7;
  line-height: 24px;
  margin: 0;
}

.main-timeline .timeline:nth-child(2n) .year{
  left: auto;
  right: 25%;
}

.main-timeline .timeline:nth-child(2n) .timeline-content{ float: left; }

.main-timeline .timeline:nth-child(2n) .year{ background: linear-gradient(to right, #9e489f, #b64877); }

.main-timeline .timeline:nth-child(2n) .timeline-icon{ background: #9e489f; }

.main-timeline .timeline:nth-child(2n) .timeline-icon:before{ border-bottom-color: #9e489f; }

.main-timeline .timeline:nth-child(3n) .year{ background: linear-gradient(to right, #6ab00f, #9fce26); }

.main-timeline .timeline:nth-child(3n) .timeline-icon{ background: #6ab00f; }

.main-timeline .timeline:nth-child(3n) .timeline-icon:before{ border-bottom-color: #6ab00f; }

.main-timeline .timeline:nth-child(4n) .year{ background: linear-gradient(to right, #d84704, #ea703f); }

.main-timeline .timeline:nth-child(4n) .timeline-icon{ background: #d44908; }

.main-timeline .timeline:nth-child(4n) .timeline-icon:before{ border-bottom-color: #d44908; }

@media only screen and (max-width: 1200px){
  .main-timeline .year{ left: 28%; }
  .main-timeline .timeline:nth-child(2n) .year{ right: 28%; }
}

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

@media only screen and (max-width: 767px){
  .main-timeline .timeline{ padding-top: 30px; }
  .main-timeline .timeline:before{
      border: 15px solid transparent;
      border-top-color: #029bbd;
      border-bottom: 10px solid transparent;
      margin: 0 auto;
      position: absolute;
      top: 1px;
      left: 0;
      z-index: 2;
  }
  .main-timeline .timeline:nth-child(2n):before{ border-top-color: #9e489f; }
  .main-timeline .timeline:nth-child(3n):before{ border-top-color: #6ab00f; }
  .main-timeline .timeline:nth-child(4n):before{ border-top-color: #d44908; }
  .main-timeline .timeline-icon{
      width: 100%;
      height: 16px;
      margin: 0;
      top: 0;
      left: 0;
  }
  .main-timeline .timeline-icon:before,
  .main-timeline .timeline-icon:after{
      border: 8px solid transparent;
      border-left: 8px solid #fff;
      top: 0;
      left: 0;
  }
  .main-timeline .timeline-icon:after{
      border-left: none;
      border-right: 8px solid #fff;
      left: auto;
      right: 0;
  }
  .main-timeline .year,
  .main-timeline .timeline:nth-child(2n) .year{
      display: block;
      margin: 0 30px 10px 30px;
      position: relative;
      top: 0;
      left: 0;
      transform: translateY(0);
  }
  .main-timeline .timeline-content,
  .main-timeline .timeline:nth-child(2n) .timeline-content{
      width: 100%;
      float: none;
      text-align: center;
      padding: 0 30px 20px;
  }
}