.vertical-align {
  display: flex;
  flex-direction: row;
}

.vertical-align > [class^="col-"],
.vertical-align > [class*=" col-"] {
  display: flex;
  align-items: center;
  justify-content: center; /* Optional, to align inner items 
                              horizontally inside the column */
}

/**
 *  Do NOT include this part into your stylesheet.
 *  "flex: 1" or "flex-grow: 1" is added to make the inner div
 *  - Which is also a flex-item - take up all the horizontal space
 *  available space inside the flex container (.col-* elements)
 */
.vertical-align > [class^="col-"] > div,
.vertical-align > [class*=" col-"] > div {
  /* flex: 1; */
  flex-grow: 1;
}