<section>
  <div>Texte</div>
  <div class="minWidth">min-width:600px </div>
</section>
section{
  height: 55px;
  background-color: rgb(220,220,220);
}
div{
  width: 30%;
  height: 50%;
  background-color: pink;
}
div.minWidth{
  min-width: 600px;
  height: 50%;
  background-color: orange;
}

External CSS

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External JavaScript

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