.hero_img {
  position: relative;
  height: 270px;
  width: 100%;
  background-size: cover;
}
.hero_img img {
  width: 100%;
  opacity: 0.6;
}
.hero_img p {
  position: absolute;
  color: #fff;
  font-size: 42px;
  font-weight: 700;
  line-height: 130%;
  text-align: center;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  width: 100%;
}
.bg_dark {
  background-image: url('https://pr.mimaki.com/hubfs/sustain/%E3%82%B0%E3%83%AB%E3%83%BC%E3%83%97%2034763.png');
  height: 270px;
}

@media screen and (max-width:999px) {
  .hero_img p {
    font-size: 38px;
}
@media screen and (max-width:499px) {
  .hero_img p {
    font-size: 20px;
  }
  .bg_dark {
    height: 200px;
  }
  .hero_img {
    height: auto;
  }
}