.tuki-bg--main::before {
  background-image: url(/store/tsukinomise/2021/articles/img/08/bg-1.jpg);
}

@media (max-width: 519px) {
  .tuki-bg--main::before {
    background-image: url(/store/tsukinomise/2021/articles/img/08/bg-1-sp.jpg);
  }
}