CSS flex-box 中身の高さ揃える

.office {
  &__list {
    @include flex_box();
    justify-content: space-between;

    li {
      @include w_percent(24);
      @include box-shadow();
      @include padding-all(20);
      background-color: rgba(#ffffe6, 0.3);
      display: flex; // ★
      flex-direction: column;　// ★

      .title {
        @include font_zen-maru_700(18);
        text-align: center;
        flex-grow: 1;　// ★
      }
    }
  }
}