@media screen and (min-width: 640px) {
  .os .os-child-header-inner {
    background-image: url("../img/mv.jpg");
  }
}

.os .os-child-header-ttl {
  width: 267.75px;
  width: 71.4vw;
}

@media screen and (min-width: 640px) {
  .os .os-child-header-ttl {
    width: calc(357px * 0.6);
  }
}

@media screen and (min-width: 767px) {
  .os .os-child-header-ttl {
    width: calc(357px * 0.7);
  }
}

@media screen and (min-width: 980px) {
  .os .os-child-header-ttl {
    width: calc(357px * 0.8);
  }
}

@media screen and (min-width: 1281px) {
  .os .os-child-header-ttl {
    width: 357px;
  }
}

.os .os-child-header-textbox {
  background: #AF6004;
}

@media screen and (min-width: 640px) {
  .os .os-child-header-textbox {
    background: rgba(160, 73, 0, 0.85);
  }
}