<div class="container">
  <div class="item">Item 1</div>
  <div class="item">Item 2</div>
  <div class="item">Item 3</div>
</div>
.container {
  display:flex;
}

.item {
  padding:10px;
  background-color: red;
  color:#fff;
  margin-right: 10px;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.