body {
  font-family: 'Source Sans Pro', Helvetica Neue, Helvetica, Arial, sans-serif;
  font-family: 'Cairo', sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

#timeline {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  background-color: #031625;
}

#timeline:hover .tl-item {
  width: 23.3333%;
}

.tl-item {
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
  position: relative;
  width: 20%;
  height: 100vh;
  min-height: 600px;
  color: #fff;
  overflow: hidden;
  -webkit-transition: width 1s ease;
  transition: width 1s ease;
}

.tl-item:before,
.tl-item:after {
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}

.tl-item:after {
  background: rgba(3, 22, 37, 0.85);
  opacity: 1;
  -webkit-transition: opacity 1s ease;
  transition: opacity 1s ease;
}

.tl-item:before {
  background: -webkit-linear-gradient(top, transparent 0%, black 75%);
  background: linear-gradient(to bottom, transparent 0%, black 75%);
  z-index: 1;
  opacity: 0;
  -webkit-transform: translate3d(0, 0, 0) translateY(50%);
  transform: translate3d(0, 0, 0) translateY(50%);
  -webkit-transition: opacity 1s ease, -webkit-transform 1s ease;
  transition: opacity 1s ease, -webkit-transform 1s ease;
  transition: opacity 1s ease, transform 1s ease;
  transition: opacity 1s ease, transform 1s ease, -webkit-transform 1s ease;
}

.tl-item:hover {
  width: 150% !important;
}

.tl-item:hover:after {
  opacity: 0;
}

.tl-item:hover:before {
  opacity: 1;
  -webkit-transform: translate3d(0, 0, 0) translateY(0);
  transform: translate3d(0, 0, 0) translateY(0);
  -webkit-transition: opacity 1s ease, -webkit-transform 1s ease 0.25s;
  transition: opacity 1s ease, -webkit-transform 1s ease 0.25s;
  transition: opacity 1s ease, transform 1s ease 0.25s;
  transition: opacity 1s ease, transform 1s ease 0.25s, -webkit-transform 1s ease 0.25s;
}

.tl-item:hover .tl-content {
  opacity: 1;
  -webkit-transform: translateY(0);
  transform: translateY(0);
  -webkit-transition: all 1.25s ease 0.80s;
  transition: all 1.25s ease 0.80s;
}

.tl-item:hover .tl-bg {
  -webkit-filter: grayscale(70%);
  filter: grayscale(70%);
}

.tl-content {
  -webkit-transform: translate3d(0, 0, 0) translateY(25px);
  transform: translate3d(0, 0, 0) translateY(25px);
  position: relative;
  z-index: 1;
  text-align: center;
  margin: 0 1.618em;
  top: 50%;
  opacity: 0;
}

.tl-content h1 {
  font-family: 'Cairo', Helvetica Neue, Helvetica, Arial, sans-serif;
  color: #008E4C;
  font-size: 1.44rem;
  font-weight: normal;
}

.tl-content a {
  font-family: 'Cairo', Helvetica Neue, Helvetica, Arial, sans-serif;
  text-transform: uppercase;
  color: #008E4C;
  font-size: 1.44rem;
  font-weight: normal;
}

.tl-year {
  position: absolute;
  top: 40%;
  left: 50%;
  -webkit-transform: translateX(-50%) translateY(-50%);
  transform: translateX(-50%) translateY(-50%);
  z-index: 1;
  border-top: 1px solid #fff;
  border-bottom: 1px solid #fff;
}

.tl-year img {
  padding: 10px;
}

.tl-year p {
  font-family: 'Cairo', Helvetica Neue, Helvetica, Arial, sans-serif;
  font-size: 1.728rem;
  line-height: 0;
}

.tl-bg {
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-size: cover;
  background-position: center center;
  -webkit-transition: -webkit-filter 0.5s ease;
  transition: -webkit-filter 0.5s ease;
  transition: filter 0.5s ease;
  transition: filter 0.5s ease, -webkit-filter 0.5s ease;
  -webkit-filter: grayscale(100%);
  filter: grayscale(100%);

}

/* if desktop */
.mobile_device_380px {
  display: none;
}

.mobile_device_480px {
  display: none;
}

a.disabled {
  pointer-events: none;
  cursor: default;
}

/* if mobile device max width 380px */
@media only screen and (max-device-width: 380px) {
  .mobile_device_380px {
    display: block;
  }

  .desktop {
    display: none;
  }
}

/* if mobile device max width 480px */
@media only screen and (max-device-width: 480px) {
  .mobile_device_480px {
    display: block;
  }

  .desktop {
    display: none;
  }
}