wx-parent/app.wxss

/**app.wxss**/
.container {
  height: calc(100vh - 40rpx);
  display: flex;
  flex-direction: column;
  align-items: center;
  /* justify-content: space-between; */
  padding: 200rpx 0;
  box-sizing: border-box;
  background: #f5f5f5;
}