<div id="parent">
  <div class="helper"></div>
  <div class="child">child1</div>
  <div class="child">child2</div>
  <div class="child">child3</div>
</div>
#parent {
  background: yellow;
  height: 200px;
}

.helper {
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}

.child {
  vertical-align: middle;
  display: inline-block;
  background: skyblue;
  margin: 0;
  padding: 0;
}

External CSS

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External JavaScript

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