.topBg {
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
}
.contentC {
  background-color: white;
  left: 0;
  right: 0;
  bottom: 0;
  margin-top: 10rpx;
  padding: 50rpx 25rpx;
  overflow-y: scroll;
}