Vertical Alignment

flex-align.css

.Aligner {
  display: flex;
  align-items: center;
  justify-content: center;
}

.Aligner-item {
  max-width: 50%;
}

.Aligner-item--top {
  align-self: flex-start;
}

.Aligner-item--bottom {
  align-self: flex-end;
}

flex-align.html

<div class="Aligner">
  <div class="Aligner-item Aligner-item--top">...</div>
  <div class="Aligner-item">...</div>
  <div class="Aligner-item Aligner-item--bottom">...</div>
</div>

table-align.css

.parent {
  display: table;
}

.child {
  display: table-cell;
  vertical-align: middle;
}

vertical-align.scss

@mixin vertical-align {
  position: relative;
  top: 50%;
  -webkit-transform: translateY(-50%);
     -moz-transform: translateY(-50%);
       -o-transform: translateY(-50%);
      -ms-transform: translateY(-50%);
          transform: translateY(-50%);
}