.mv-sec {
  padding-bottom: 290px;
}
.mv-sec::before {
  aspect-ratio: 1373/455;
  bottom: 0;
}
@media screen and (max-width: 767px) {
  .mv-sec {
    padding-bottom: 47%;
  }
}
@media screen and (max-width: 575px) {
  .mv-illust {
      bottom: 15.7%;
  }
}