.readmore-btn {
    display: none;
}

.readmore-check {
    display: none;
  }

@media screen and (min-width: 768px) {/* スクリーンサイズが768px以上の場合に適用 */
.readmore-wrap {
    position: relative;
  }
  .readmore-btn {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    bottom: -10px;
    width: 100%;
    margin: 0 auto;
    text-align: center;
    z-index: 10;
    height: 5rem;
    background: linear-gradient( 180deg , rgba(255,255,255,0) 0,rgba(255,255,255,0.9) 30%, rgba(255,255,255,1) 100%);
}
.readmore-btn p{
  background: linear-gradient( 180deg , #4d4d4d 0, #1b1b1b 50%, #191919 50%, #636363 100%);
  color: #eee;
  font-weight: bold;
  border: 1px solid #aaa;
  width: 160px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 2.4rem;
  padding: 5px 0;
  border-radius: 15px 15px 15px 15px/50% 50% 50% 50%;
}
  .readmore-text {
    position: relative;
    overflow: hidden;
    height: 580px;
  }
  .readmore-check {
    display: none;
  }
  .readmore-check:checked + .readmore-btn{
    display: none;
  }
  .readmore-check:checked ~ .readmore-text {
    height: auto;
  }

  .row .feature_item_list {
    margin: auto;
  }

}