如何在CSS中保持不同內容長度的列的高度相等？

@media (min-width: 768px) {
  .content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
  }

  .content > * {
    flex-basis: calc(50% - 30px);
  }

  .content h2 {                     /*  1st row  */
    order: 0;
  }
  .content p {                      /*  2nd row  */
    order: 1;
  }
  .content p + p {                  /*  3rd row  */
    order: 2;
    flex-basis: calc(100% - 30px);  /* as only 1 `p` in markup, it need 100% width,
                                       or add an extra empty in the markup  */
  }
  .content ul {                     /*  4th row  */
    order: 3;
  }
}