lanxin/css/components/banner.css

.banner {
  width: 100%;
  height: 30rem;
  background: black;
  position: relative;
  background-repeat: no-repeat;
  background-size: 100% auto;
}
.banner-title {
  font-size: 3.125rem;
  font-weight: normal;
  color: #ffffff;
  position: absolute;
  left: 50%;
  top: calc((30rem - 5.25rem) / 2);
  transform: translate(-50%, 0);
}