.timeline,
.s-drive {
  width: 80%;
  margin: 0 auto;
  position: relative;
  transition: 0.4s;
}
.timeline .timeline-box,
.timeline .s-drive-box,
.s-drive .timeline-box,
.s-drive .s-drive-box {
  height: 360px;
  overflow: hidden;
  transition: 0.4s;
}
.timeline::before,
.s-drive::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -40px;
  width: 100%;
  height: 100px;
  background: rgb(0, 0, 0);
  background: linear-gradient(0deg, rgb(248, 248, 247) 70%, rgba(255, 255, 255, 0) 100%);
  transition: 0.4s;
}

.timeline .timeline-box {
  width: 90%;
  margin: 0 auto;
}
.timeline div {
  border-bottom: solid 1px #281a14;
  padding: 35px 0 25px;
}
.timeline div dt {
  font-family: adobe-garamond-pro, serif;
  font-weight: bold;
  display: block;
  margin: 0;
  font-size: 2em;
  color: #a7a7a7;
}
.timeline div dt span {
  font-size: 0.7em;
}
.timeline div dd {
  line-height: 1.5em;
  display: block;
  margin: 0;
}

.inr-title{
  font-weight: bold;
  font-family: adobe-garamond-pro, serif;
  font-size: 2rem;
}

.inr-text{
  margin-top: 10px;
}

/*繧ｯ繝ｩ繧ｹ莉倅ｸ取凾縺ｮ繧ｹ繧ｿ繧､繝ｫ*/
.timeline.active:before,
.s-drive.active:before {
  content: none;
}

.btn-histry.down,
.btn-design.down,
.btn-other.down {
  bottom: -80px;
}

.timeline.active {
  height: auto !important;
}
.timeline.active .timeline-box {
  height: 66rem;
}
@media screen and (max-width: 600px) {
  .timeline .timeline-box{
    width: 100%;
  }
  .timeline-box{
    width: 100%;
  }
  .timeline-box div {
    display: block;
  }
  .timeline-box div dt {
    width: 100%;
    font-size: 1.8em;
    color: #a7a7a7;
  }
  .timeline-box div dd {
    width: 100%;
    margin: 0;
  }
  
.inr-title{
  font-size: 1.5em;
}

  .timeline{
    padding: 0;
  }
  .timeline.active {
    height: auto !important;
  }
  .timeline.active .timeline-box {
    height: 104rem;
  }
    .timeline.active {
    height: auto !important;
  }
  .timeline.active .timeline-box {
    height: 77rem;
  }
  .ctn_more button{
    width: 50%;
  }
}