.info_sec.info_sec_under {
  padding-top: 50px;
  padding-bottom: 0;
}
@media print, screen and (min-width: 920px) {
  .info_sec.info_sec_under {
    padding-top: 100px;
  }
}

.back_top {
  margin-top: 50px;
  text-align: center;
}
@media print, screen and (min-width: 920px) {
  .back_top {
    margin-top: 80px;
  }
}

.back_top_button {
  text-align: left;
}
.back_top_button::after {
  background-image: url(../img/common/arrow_icon.png);
  background-repeat: no-repeat;
  background-position: center center;
  background-size: contain;
  width: 13px;
  height: 13px;
  right: 19px;
}
@media print, screen and (min-width: 920px) {
  .back_top_button::after {
    width: 17px;
    height: 17px;
    right: 24px;
  }
}