.demo {
  background: #293335 !important;
}

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

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

.main-timeline .timeline {
  width: 50%;
  float: left;
  position: relative;
}

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

.main-timeline .timeline:before {
  content: "";
  width: 45%;
  height: 3px;
  background: #fff;
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
}

.main-timeline .year {
  display: block;
  width: 120px;
  height: 120px;
  line-height: 120px;
  border-radius: 50%;
  background: #e3bd40;
  font-size: 30px;
  font-weight: bold;
  color: #23363a;
  text-align: center;
  position: absolute;
  top: 50%;
  right: 7%;
  transform: translateY(-50%);
}

.main-timeline .timeline-content {
  width: 65%;
  padding: 40px;
  background: #e3bd40;
  position: relative;
}

.main-timeline .timeline-content:after {
  content: "";
  border-bottom: 40px solid #23363a;
  border-left: 40px solid transparent;
  position: absolute;
  bottom: 20px;
  right: 20px;
}

.main-timeline .title {
  font-size: 19px;
  font-weight: bold;
  color: #fff;
  margin: 0 0 10px 0;
}

.main-timeline .description {
  font-size: 14px;
  color: #fff;
  margin: 0;
}

.main-timeline .timeline:nth-child(2n):before {
  right: auto;
  left: 0;
}

.main-timeline .timeline:nth-child(2n) .year {
  right: auto;
  left: 7%;
}

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

.main-timeline .timeline:nth-child(2) {
  margin-top: 160px;
}

.main-timeline .timeline:nth-child(odd) {
  margin: -160px 0 0 0;
}

.main-timeline .timeline:nth-child(even) {
  margin-bottom: 70px;
}

.main-timeline .timeline:first-child,
.main-timeline .timeline:last-child:nth-child(even) {
  margin: 0;
}

.main-timeline .timeline:nth-child(2n) .year,
.main-timeline .timeline:nth-child(2n) .timeline-content {
  background: #ff6cba;
}

.main-timeline .timeline:nth-child(3n) .year,
.main-timeline .timeline:nth-child(3n) .timeline-content {
  background: #60bee4;
}

.main-timeline .timeline:nth-child(4n) .year,
.main-timeline .timeline:nth-child(4n) .timeline-content {
  background: #a3cc42;
}

@media only screen and (max-width: 1200px) {
  .main-timeline .year {
    width: 100px;
    height: 100px;
    line-height: 100px;
  }
}

@media only screen and (max-width: 990px) and (min-width: 768px) {
  .main-timeline .year {
    width: 80px;
    height: 80px;
    line-height: 80px;
    font-size: 24px;
  }
}

@media only screen and (max-width: 767px) {
  .main-timeline:before,
  .main-timeline .timeline:before {
    display: none;
  }
  .main-timeline .timeline,
  .main-timeline .timeline:nth-child(even),
  .main-timeline .timeline:nth-child(odd) {
    width: 100%;
    float: none;
    text-align: center;
    margin: 0;
  }
  .main-timeline .timeline {
    margin-bottom: 20px !important;
  }
  .main-timeline .timeline:last-child {
    margin-bottom: 0 !important;
  }
  .main-timeline .year,
  .main-timeline .timeline:nth-child(2n) .year {
    margin: 0 auto 10px;
    position: relative;
    top: 0;
    left: 0;
    transform: translateY(0);
  }
  .main-timeline .year:after {
    content: "";
    width: 3px;
    height: 20px;
    background: #fff;
    position: absolute;
    bottom: -20px;
    left: 50%;
    z-index: 1;
    transform: translate(-50%);
  }
  .main-timeline .timeline .timeline-content {
    width: 100%;
    float: none;
    padding: 40px;
  }
  .main-timeline .timeline .timeline-content:before {
    content: "";
    border-bottom: 40px solid #23363a;
    border-right: 40px solid transparent;
    position: absolute;
    bottom: 20px;
    left: 20px;
  }
}