ul.h_gnav li:nth-of-type(3) {
  position: relative;
  margin-left: 10px;
}

ul.h_gnav li:nth-of-type(3)::before {
  position: absolute;
  content: '';
  background: url(../img/nav_icon.png) no-repeat;
  top: 1px;
  left: -25px;
  width: 18px;
  height: 23px;
}

/*  下層ページ */
#s1_sub {
  background: none;
}

@media (width < 770px) {
  #s1_sub {
    margin-top: 150px;
    padding: 0 20px;
  }

  .heading_ttl h2 {
    text-align: center;
  }
}