.timeline {
  display: flex;
  /*background-color: #031625;*/
}
.timeline:hover .tl-item {
  width: 18%;
}
.tl-item {
  transform: translate3d(0, 0, 0);
  position: relative;
  width: 25%;
  height: 70vh;
  min-height: 600px;
  color: #fff;
  overflow: hidden;
  transition: width 0.5s ease;
}
.tl-item:before, .tl-item:after {
  transform: translate3d(0, 0, 0);
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}
.tl-item:after {
  /*background: rgba(92, 108, 116, 0.85);*/
  background: rgba(18, 44, 68, 0.85);
  opacity: 1;
  transition: opacity 0.5s ease;
}
.tl-item:before {
  background: linear-gradient(to bottom, rgba(0, 0, 0, .6) 0%,rgb(27,27,27));
  z-index: 1;
  opacity: 0;
  transform: translate3d(0, 0, 0) translateY(50%);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.tl-item:hover {
  width: 30% !important;
}
.tl-item:hover:after {
  opacity: 0;
}
.tl-item:hover:before {
  opacity: 1;
  transform: translate3d(0, 0, 0) translateY(0);
  transition: opacity 1s ease, transform 1s ease 0.25s;
}
.tl-item:hover .tl-content {
  opacity: 1;
  transform: translateY(50px);
  transition: all 0.75s ease 0.5s;
}
.tl-item:hover .tl-bg {
  filter: grayscale(0);
}
.tl-content {
  transform: translate3d(0, 0, 0) translateY(25px);
  position: relative;
  z-index: 1;
  text-align: center;
  margin: 0 1.618em;
  top: 55%;
  opacity: 0;
}
.tl-content p {
  margin: 0;
}
.tl-content h2 {
  color: #1779cf;
  font-size: 1.44rem;
  font-weight: normal;
}
.tl-year {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateX(-50%) translateY(-50%);
  z-index: 1;
  border-bottom: 1px solid #fff;
}
.tl-year p {
  font-size: 1.728rem;
  margin-bottom: .2rem;
}
.tl-bg {
  transform: translate3d(0, 0, 0);
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-size: cover;
  background-position: center center;
  transition: filter 0.5s ease;
  filter: grayscale(100%);
}
.tl-step {
  position: absolute;
  top: 40%;
  left: 40%;
  transform: translateX(-40%) translateY(-40%);
  color: white;
  z-index: 1;
  font-size: 1.2rem;
}
.tl-title {
  color: white;
  font-size: 16pt;
  padding: 20px 0;
  padding-left: 50px;
}
.tl-content h2 a {
  color: rgb(91, 253, 172);
}
@media (min-width:1401px) {
  .mobile-time {
    display: none;
  }
}
@media (max-width:1400px) {
  .pc-time {
    display: none;
  }
  .tl-item {
    height: 30vh;
    min-height: 300px;
  }
  .tl-step {
    top:35%;
  }
  .tl-item:hover .tl-step {
    top:20%;
    transition: 1s all ease;
  }
  .tl-item:hover .tl-content {
    transform: translateY(-25px);
    text-align: start;

  }
  .tl-year {
    top: 50%;
  }
  .tl-item:hover .tl-year {
    top: 35%;
    transition: 1s all ease;
  }
}
@media (max-width:500px) {
  .mobile-time .tl-title {
    font-size: 14pt;
    padding-left: 20px;
  }
}