.timeline{
    margin: 100px auto;
    background: #171717;
    padding: 80px;
}
.line-timeline {
  position: relative;
}

.line-timeline div.spandiv {
  width: 100%;
  height: 300px;
  position: relative;
}

.dem {
  position: absolute;
  width: 96%;
  height: 150px;
  margin: auto;
  left: 0;
  right: 0;
}

.dem1 {
  top: 0;
  border-top: 4px solid #ffffff;
  border-left: 4px solid #ffffff;
  border-bottom: 4px solid #ffffff;
}

.dem2 {
  top: 150px;
  border-right: 4px solid #ffffff;
  border-bottom: 4px solid #ffffff;
}

.line-timeline div.spandiv span {
  position: absolute;
  width: 30px;
  height: 30px;
  background: white;
  border-radius: 50px;
  border: 8px solid #525050;
  z-index: 2;
  cursor: pointer;
  transition: .3s ease-out;
}

.line-timeline div.spandiv span#timeline1 {
  right: -10px;
  top: -13px;
}

.line-timeline div.spandiv span#timeline2 {
  left: -10px;
  top: -13px;
}

.line-timeline div.spandiv span#timeline3 {
  left: -10px;
  top: 0;
  bottom: 0;
  margin: auto;
}

.line-timeline div.spandiv span#timeline4 {
  right: -10px;
  top: 0;
  bottom: 0;
  margin: auto;
}

.line-timeline div.spandiv span#timeline5 {
  right: -10px;
  bottom: -13px;
}

.line-timeline div.spandiv span#timeline6 {
  left: -14px;
  bottom: -13px;
}

.line-timeline div.spandiv span:hover {
  background: black;
  border: 11px solid white;
}

.line-timeline div.spandiv span.active-timeline {
  background: black;
  border: 11px solid white;
}


/* timeline content css */

.content-timeline {
  color: white;
  text-align: justify;
  line-height: 2;
  font-size: 19px;
  padding: 25px;
  position: relative;
}

.content-timeline p {
  opacity: 0;
  visibility: hidden;
  transition: .3s ease-in-out;
  position: absolute;
  right: 0;
  left: 0;
  top: 0;
  bottom: 0;
  margin: auto;
  padding: 15px;
}

.content-timeline p.active-content-timeline {
  opacity: 1;
  visibility: visible;
}