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

.main-timeline .timeline{
  position: relative;
  margin-top: -79px;
}

.main-timeline .timeline:first-child{ margin-top: 0; }

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

.main-timeline .timeline:before{
  content: "";
  width: 100%;
  height: 100%;
  box-shadow: -8px 0 5px -5px rgba(0, 0, 0, 0.5) inset;
  position: absolute;
  top: 0;
  right: 0;
  z-index: 2;
}

.main-timeline .timeline-icon{
  width: 210px;
  height: 210px;
  border-radius: 50%;
  border: 25px solid transparent;
  border-top-color: #f44556;
  border-right-color: #f44556;
  margin: auto;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: 1;
  transform: rotate(45deg);
}

.main-timeline .year{
  display: block;
  width: 110px;
  height: 110px;
  line-height: 110px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 20px rgba(0,0,0,0.4);
  margin: auto;
  font-size: 14px;
  font-weight: bold;
  color: #f44556;
  text-align: center;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  transform: rotate(-45deg);
}

.main-timeline .timeline-content{
  width: 35%;
  float: right;
  background: #f44556;
  padding: 30px 20px;
  margin: 50px 0;
  z-index: 1;
  position: relative;
}

.main-timeline .timeline-content:before{
  content: "";
  width: 20%;
  height: 15px;
  background: #f44556;
  position: absolute;
  top: 50%;
  left: -20%;
  z-index: -1;
  transform: translateY(-50%);
}

.main-timeline .title{
  font-size: 20px;
  font-weight: bold;
  color: #fff;
  margin: 0 0 10px 0;
}

.main-timeline .description{
  font-size: 16px;
  color: #fff;
  line-height: 24px;
  margin: 0;
}

.main-timeline .timeline:nth-child(2n):before{ box-shadow: 8px 0 5px -5px rgba(0, 0, 0, 0.5) inset; }

.main-timeline .timeline:nth-child(2n) .timeline-icon{ transform: rotate(-135deg); }

.main-timeline .timeline:nth-child(2n) .year{ transform: rotate(135deg); }

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

.main-timeline .timeline:nth-child(2n) .timeline-content:before{
  left: auto;
  right: -20%;
}

.main-timeline .timeline:nth-child(2n) .timeline-icon{
  border-top-color: #e97e2e;
  border-right-color: #e97e2e;
}

.main-timeline .timeline:nth-child(2n) .year{ color: #e97e2e; }

.main-timeline .timeline:nth-child(2n) .timeline-content,
.main-timeline .timeline:nth-child(2n) .timeline-content:before{ background: #e97e2e; }

.main-timeline .timeline:nth-child(3n) .timeline-icon{
  border-top-color: #13afae;
  border-right-color: #13afae;
}

.main-timeline .timeline:nth-child(3n) .year{ color: #13afae; }

.main-timeline .timeline:nth-child(3n) .timeline-content,
.main-timeline .timeline:nth-child(3n) .timeline-content:before{ background: #13afae; }

.main-timeline .timeline:nth-child(4n) .timeline-icon{
  border-top-color: #105572;
  border-right-color: #105572;
}

.main-timeline .timeline:nth-child(4n) .year{ color: #105572; }

.main-timeline .timeline:nth-child(4n) .timeline-content,
.main-timeline .timeline:nth-child(4n) .timeline-content:before{ background: #105572; }

@media only screen and (max-width: 1199px){
  .main-timeline .timeline{ margin-top: -103px; }
  .main-timeline .timeline-content:before{ left: -18%; }
  .main-timeline .timeline:nth-child(2n) .timeline-content:before{ right: -18%; }
}

@media only screen and (max-width: 990px){
  .main-timeline .timeline{ margin-top: -127px; }
  .main-timeline .timeline-content:before{ left: -2%; }
  .main-timeline .timeline:nth-child(2n) .timeline-content:before{ right: -2%; }
}

@media only screen and (max-width: 767px){
  .main-timeline .timeline{
      margin-top: 0;
      overflow: hidden;
  }
  .main-timeline .timeline:before,
  .main-timeline .timeline:nth-child(2n):before{
      box-shadow: none;
  }
  .main-timeline .timeline-icon,
  .main-timeline .timeline:nth-child(2n) .timeline-icon{
      margin-top: -30px;
      margin-bottom: 20px;
      position: relative;
      transform: rotate(135deg);
  }
  .main-timeline .year,
  .main-timeline .timeline:nth-child(2n) .year{ transform: rotate(-135deg); }
  .main-timeline .timeline-content,
  .main-timeline .timeline:nth-child(2n) .timeline-content{
      width: 100%;
      float: none;
      border-radius: 0 0 20px 20px;
      text-align: center;
      padding: 25px 20px;
      margin: 0 auto;
  }
  .main-timeline .timeline-content:before,
  .main-timeline .timeline:nth-child(2n) .timeline-content:before{
      width: 15px;
      height: 25px;
      position: absolute;
      top: -22px;
      left: 50%;
      z-index: -1;
      transform: translate(-50%,0);
  }
}