html,
body,
.wrap {
  height: 100%;
}

.wrap .inner .btns {
  position: absolute;
  top: 4rem;
  width: 100%;
  height: .82rem;
}

.wrap .inner .bannerbox {
  width: 100%;
  top: 6.4rem;
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
}

.wrap .inner .bannerbox .banner {
  width: 86%;
  height: 3.5rem;
  overflow: hidden;
}

.wrap .inner .bannerbox .banner img {
  width: 2.1rem;
  height: 3.5rem;
  border-radius: .1rem;
}

.top_header {
  top: 0;
  max-width: 7.5rem;
  z-index: 99;
  position: fixed;
  line-height: 50px;
  text-align: center;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
}