CSS - Flexbox => same height divs / vertically centered content

flexbox-same-height-div.css

//SAME HEIGHT + VERTICALLY CENTERED CONTENT
.parent {
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  justify-content: center;
}

child {
  width: 33.33%;  /* Or whatever */
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  flex-direction: column;
  justify-content: center;
}


//SAME HEIGHT
.parent {
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-wrap: wrap;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
}

.child {
  width: 33.33%;  /* Or whatever */
  -webkit-box-flex: 1;
  -moz-box-flex: 1;
  -webkit-flex: 1;
  -ms-flex: 1;
  flex: 1;
}