How to vertically center the contents of a flexbox item

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It can be achieved by displaying each flex item as a flex container and then aligning the contents vertically by align-items property, as follows:

.flex-container {
  display:flex;
  align-items:center;
  height: 200px; /* for demo */
}

.flex-item {
  align-self:stretch;
  display:flex;
  align-items:center;
  background-color: gold; /* for demo */
}
<div class="flex-container">
    <div class="flex-item">
      I want to be vertically centered!
      <s>But I'm not.</s>
  </div>
</div>

As a side-note, if you omit the align-items:center; declaration of the .flex-container you can safely remove align-self:stretch; from flex items as well.

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