.main-content__product-detail:nth-child(4)::before {
  top: 400px;
  left: 0;
  width: 100%;
  height: 310px;
  background: url(https://file001.shop-pro.jp/PA01084/901/treatsfactory/img/img_bg_footprint01.png) repeat-x top left/contain;
}
.main-content__product-detail:nth-child(4)::after {
  bottom: -80px;
  right: 0;
  width: 70%;
  height: 384px;
  background: url(https://file001.shop-pro.jp/PA01084/901/treatsfactory/img/img_bg_footprint02.png) no-repeat center right/cover;
}

.product__explain img {
   width: 100%;
   height: auto;
}

  /* 店長一言メモ */
  .tencyo {
    color: #000000;
    font-weight: bold;
}