.article_page .sub_page__keyvisual {
  background: url(./img/keyvisual.jpg) 50% center no-repeat;
  background-size: cover;
}

@media (max-width: 767px) {
  .article_page .sub_page__keyvisual {
    background: url(./img/keyvisual_sp.jpg) 50% center no-repeat;
    background-size: cover;
  }

  .sub_page__bg_overlay {
    background-color: unset;
  }
}

.c-article_bt {
  font-weight: bold;
}