CodePen Embed - Responsive without MQs, step 1

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  <article style="flex: 1; min-width: 250px; height: 50px; background: #fbb;">1</article>
  <article style="flex: 1; min-width: 250px; height: 50px; background: #bfb;">2</article>
  <article style="flex: 1; min-width: 250px; height: 50px; background: #bbf;">3</article>
</section>

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