.w-900 {
  width: 900px;
  margin-left: auto;
  margin-right: auto;
  overflow: hidden;
}
@media screen and (max-width: 1024px) {
  .w-900 {
    width: 100%;
    height: auto;
  }
  .w-900 img {
    height: auto;
  }
}

body, p, h1, h2, h3, h4 {
  margin: 0;
}

.oseibo {
  position: relative;
}
@media screen and (max-width: 1024px) {
  .oseibo .oseibo-bg {
    width: 100vw;
  }
}
.oseibo h3 {
  position: absolute;
  top: 0;
  left: 50px;
  height: 100%;
  padding: 30px;
  transform: translateY(50px);
  font-family: "Ryumin";
  line-height: 1.8;
  font-weight: normal;
  font-size: 45.8px;
  color: #A1272D;
  -ms-writing-mode: tb-rl;
  writing-mode: vertical-rl;
  background: linear-gradient(to bottom, rgb(255, 255, 255), rgba(255, 255, 255, 0.973), rgba(255, 255, 255, 0.486));
}
@media screen and (max-width: 1024px) {
  .oseibo h3 {
    left: 5.556vw;
    padding: 3.333vw;
    transform: translateY(5.555vw);
    font-size: 5.089vw;
  }
}
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