.content {
  min-height: 1000px;
  position: relative;
  overflow: hidden;
}
.content .schoolIntro-bg {
  position: absolute;
  left: 160px;
  top: 400px;
  width: 689px;
  height: 430px;
  opacity: 1;
}
.content .top-left-bg {
  position: absolute;
  left: -261px;
  top: -417px;
  width: 748px;
  height: 834px;
  transform: rotate(180deg);
  opacity: 0.4;
}
.content .bottom-right-bg {
  position: absolute;
  right: -180px;
  bottom: -220px;
  width: 624px;
  height: 696px;
  transform: rotate(180deg);
  opacity: 0.4;
}