.about_big_box {
  width: 1200px;
  margin: 110px auto 0;
}
.about_big_box .ab_item .ab_i_top {
  margin-bottom: 42px;
}
.about_big_box .ab_item .ab_i_top .ab_it_img {
  margin: 0 auto;
  width: 187px;
  height: 70px;
}
.about_big_box .ab_item .ab_i_top .ab_it_img img {
  width: 187px;
  height: 70px;
}
.about_big_box .ab_item .ab_i_top .ab_it_text {
  margin-top: 24px;
  text-align: center;
  font-family: Noto Sans JP, Noto Sans JP;
  font-weight: bold;
  font-size: 50px;
  color: #000000;
}
.about_big_box .ab_item .ab_i_text {
  width: 1200px;
  font-family: Noto Sans JP, Noto Sans JP;
  font-weight: 400;
  font-size: 16px;
  color: rgba(0, 0, 0, 0.72);
  line-height: 19px;
  /* text-align: center; */
}
.about_big_box .ab_item .ab_i_tabel {
  margin-top: 72px;
  border: 1px solid #f4f4f4;
}
.about_big_box .ab_item .ab_i_tabel .ab_it_item {
  display: flex;
  align-items: center;
  font-family: Noto Sans JP, Noto Sans JP;
  font-size: 16px;
  border-bottom: 1px solid #f4f4f4;
}
.about_big_box .ab_item .ab_i_tabel .ab_it_item:last-child {
  border-bottom: none;
}
.about_big_box .ab_item .ab_i_tabel .ab_it_item .ab_iti_key {
  width: 192px;
  font-weight: 500;
  color: #000000;
  padding: 20px 24px;
}
.about_big_box .ab_item .ab_i_tabel .ab_it_item .ab_iti_value {
  flex: 1;
  padding: 20px 24px;
  border-left: 1px solid #f4f4f4;
  font-weight: 400;
  line-height: 150%;
  color: rgba(0, 0, 0, 0.72);
}
.about_big_box .ab_one {
  margin-bottom: 72px;
}
.about_big_box .ab_mb_back {
  display: none;
}
@media screen and (max-width: 750px) {
  .about_big_box {
    width: 100%;
    margin: 70px 0;
    position: relative;
  }
  .about_big_box .ab_item {
    width: 320px;
    margin: 0 auto;
  }
  .about_big_box .ab_item .ab_i_top {
    margin-bottom: 25px;
  }
  .about_big_box .ab_item .ab_i_top .ab_it_img {
    margin: 0 auto;
    width: 75px;
    height: auto;
  }
  .about_big_box .ab_item .ab_i_top .ab_it_img img {
    width: 75px;
    height: auto;
  }
  .about_big_box .ab_item .ab_i_top .ab_it_text {
    font-size: 24px;
    margin-top: 12px;
  }
  .about_big_box .ab_item .ab_i_text {
    width: 100%;
    font-size: 14px;
    line-height: 150%;
    text-align: left;
  }
  .about_big_box .ab_item .ab_i_tabel {
    margin-top: 27px;
  }
  .about_big_box .ab_item .ab_i_tabel .ab_it_item .ab_iti_key {
    width: 118px;
    font-weight: 500;
    color: #000000;
    line-height: 150%;
    padding: 7px 10px;
    text-align: center;
  }
  .about_big_box .ab_item .ab_i_tabel .ab_it_item .ab_iti_value {
    flex: 1;
    padding: 7px 20px;
    border-left: 1px solid #f4f4f4;
    font-weight: 400;
    line-height: 150%;
    color: rgba(0, 0, 0, 0.72);
  }
  .about_big_box .ab_one {
    margin-bottom: 52px;
  }
  .about_big_box .ab_mb_back {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    /* margin-top: 50px; */
    /* margin-left: 190px; */
    width: fit-content;
    position: absolute;
    bottom: -45px;
    right: 10%;
  }
  .about_big_box .ab_mb_back img {
    width: 16px;
    height: 16px;
  }
  .about_big_box .ab_mb_back span {
    font-family: Noto Sans JP, Noto Sans JP;
    font-weight: bold;
    font-size: 12px;
    color: #777;
  }
}