<div class="flex">
  <div class="item1"></div>
  <div class="item2"></div>
  <div class="item3"></div>
</div>
.flex {
  display: flex;
  background: orange;
}

.item1,
.item2,
.item3 {
  height: 100px;
  width: 100px;
  background: black;
}

.item1,
.item2 {
  margin: 10px;
}

.item3 {
  margin: 10px 10px 10px auto;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.