.content.fixed-back-ground {
  background-color: transparent;
}
.fixed-back-ground::before {
  content: '';
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
  width: 100%;
  height: 100vh;
  background-image: url(/facilities/images/bg_fixed-left.png), url(/facilities/images/bg_fixed-right.png);
  background-color: #f6f6f6;
  background-repeat: no-repeat;
  background-position: center left calc(50% - 650px), bottom left calc(50% + 650px);
}

@media (min-width:1px) and (max-width: 750px) {
  .fixed-back-ground::before {
    background-image: url(/facilities/images/bg_fixed-left-sp.png), url(/facilities/images/bg_fixed-right-sp.png);
    background-position: bottom calc(50% - 30px) left, bottom calc(50% - 120px) right;
    background-size: 53px, 35px;
  }
}