WGShare.Client.Wx/pages/popup/custom-close/index.wxss

.block {
  position: relative;
  width: 240px;
  height: 240px;
  background: #fff;
  border-radius: 16rpx;
}

.close-btn {
  position: absolute;
  left: 50%;
  margin-left: -32rpx;
  bottom: calc(-1 * (48rpx + 64rpx));
}

.wrapper {
  margin: 32rpx;
  display: block;
}