.bi-flex-wrapper-vertical-center {
  & .flex-wrapper-vertical-center-wrapper {
    display: box; /* OLD - Android 4.4- */
    display: -webkit-box; /* OLD - iOS 6-, Safari 3.1-6 */
    display: -moz-box; /* OLD - Firefox 19- (buggy but mostly works) */
    display: -ms-flexbox; /* TWEENER - IE 10 */
    display: -webkit-flex; /* NEW - Chrome */
    display: flex; /* NEW, Spec - Opera 12.1, Firefox 20+ */
    /* 09版 */
    -webkit-box-orient: vertical;
    /* 12版 */
    -webkit-flex-direction: column;
    -moz-flex-direction: column;
    -ms-flex-direction: column;
    -o-flex-direction: column;
    flex-direction: column;

    /* 09版 */
    -webkit-box-pack: center;
    /* 12版 */
    -webkit-justify-content: center;
    -moz-justify-content: center;
    -ms-justify-content: center;
    -o-justify-content: center;
    justify-content: center;

    /* 09版 */
    -webkit-box-align: flex-start;
    /* 12版 */
    -webkit-align-items: flex-start;
    -moz-align-items: flex-start;
    -ms-align-items: flex-start;
    -o-align-items: flex-start;
    align-items: flex-start;

    /* 09版 */
    /*-webkit-box-lines: multiple;*/
    /* 12版 */
    -webkit-flex-wrap: nowrap;
    -moz-flex-wrap: nowrap;
    -ms-flex-wrap: nowrap;
    -o-flex-wrap: nowrap;
    flex-wrap: nowrap;

    min-height: 100%;
    float: left;

    &.stretch {
      width: 100%;
      /* 09版 */
      -webkit-box-align: stretch;
      /* 12版 */
      -webkit-align-items: stretch;
      -moz-align-items: stretch;
      -ms-align-items: stretch;
      -o-align-items: stretch;
      align-items: stretch;
    }
  }
}