.page_image {
  background: url(/img/page_header/page_header_about_us.jpg) no-repeat top center;
  background-size: cover;
}

.row_reverse {
  flex-direction: row-reverse;
}

.about_us_title_lv1 {
  font-size: 20px;
  border-left: solid 4px #0091b0;
  padding-left: 10px;
  margin-bottom: 15px;
}

.message_imp {
  color: #0091b0;
  font-size: 16px;
}

.greeting_img {
  margin-bottom: 20px;
}

.greeting_sign {
  text-align: right;
}

.table_view_area {
  width: 100%;
  overflow: auto;
}

.about_us_table {
  width: 500px;
  font-size: 12px;
}

.about_us_table th, .about_us_table td {
  border-bottom: solid 1px #ccc;
  padding: 10px;
}

.about_us_table th {
  text-align: center;
}

.about_us_table .suido_shitei td {
  border-bottom: none;
  padding: 0 15px 0 0;
}

.guideline_list {
  list-style-type: disc;
  padding-left: 20px;
}

.guideline_list li {
  margin-bottom: 10px;
}

.history {
  display: flex;
  flex-wrap: wrap;
  font-size: 12px;
  position: relative;
}

.history dt {
  width: 86px;
  position: relative;
}

.history dt::before {
  content: " ";
  display: block;
  width: 11px;
  height: 11px;
  background-color: #999;
  border-radius: 6px;
  position: absolute;
  top: 2px;
  right: -6px;
}

.history dd {
  width: calc(100% - 90px);
  padding-left: 10px;
}

.history::before {
  content: " ";
  display: block;
  width: 1px;
  background-color: #999;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 86px;
}

@media screen and (min-width: 48em) {
  .about_us_title_lv1 {
    font-size: 20px;
    border-left: solid 4px #0091b0;
    padding-left: 10px;
    margin-bottom: 15px;
  }
  .message_imp {
    font-size: 18px;
  }
  .table_view_area {
    width: 100%;
    overflow: auto;
  }
  .about_us_table {
    width: 100%;
    margin: 0 auto;
    font-size: 14px;
  }
  .about_us_table th, .about_us_table td {
    padding: 10px;
  }
  .about_us_table th {
    width: 200px;
  }
  .guideline_list li {
    margin-bottom: 10px;
  }
  .history {
    font-size: 14px;
  }
  .history dt {
    width: 200px;
    margin-bottom: 20px;
    text-align: right;
    padding-right: 60px;
  }
  .history dt::before {
    width: 11px;
    height: 11px;
    border-radius: 6px;
    top: 4px;
    right: 19px;
  }
  .history dd {
    width: calc(100% - 200px);
    padding-left: 10px;
    margin-bottom: 20px;
  }
  .history::before {
    left: 175px;
  }
}

@media screen and (min-width: 62em) {
  .about_us_title_lv1 {
    font-size: 24px;
    padding-left: 10px;
    margin-bottom: 20px;
  }
  .message_imp {
    font-size: 20px;
  }
  .table_view_area {
    width: 100%;
    overflow: auto;
  }
  .about_us_table {
    font-size: 14px;
  }
  .about_us_table th, .about_us_table td {
    padding: 14px;
  }
  .guideline_list li {
    margin-bottom: 10px;
  }
  .history {
    width: 100%;
    margin: 0 auto;
    font-size: 14px;
  }
  .history dt {
    margin-bottom: 20px;
  }
  .history dt::before {
    top: 4px;
    right: 19px;
  }
  .history dd {
    margin-bottom: 20px;
  }
}