---

• Example of vertical centering with display:flex;, https://philipwalton.github.io/solved-by-flexbox/demos/vertical-centering/.
• HTML codes.

<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>

• CSS codes.

.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;
}

• I had this problem with horizontal aligning of <video>. The solution was actually at the align-items: center; part. the align-items: center; part.