section.first_section {
  background: #FFFFFF;
}

@media screen and (min-width: 768px) {
  #subpage_title_area h1 {
    font-size: 42px;
  }
  section.first_section {
    padding-bottom: 100px;
  }
  section.first_section section.contents {
    width: 1040px;
    margin: 45px auto 0;
  }
  section.first_section section.contents:nth-of-type(1) {
    margin-top: 100px;
  }
  section.first_section section.contents h2 {
    font-size: 19px;
  }
  section.first_section section.contents .txt {
    margin-top: 15px;
    line-height: 1.7;
  }
}