<div class="wrapper">
  <div class="box">1</div>
  <div class="box">2</div>
  <div class="box">3</div>
</div>

<div class="wrapper2">
  <div class="box">1</div>
  <div class="box">2</div>
  <div class="box">3</div>  
</div>
body {
  margin: 40px;
}

.box {
  background-color: #444;
  color: #fff;
  border-radius: 5px;
  padding: 20px;
  font-size: 150%;
}

.box:nth-child(even) {
  background-color: #ccc;
  color: #000;
}

	.wrapper {
		display: grid;
    border:1px solid #000;
    grid-gap: 10px;
		grid-template-columns: repeat(auto-fill, minmax(200px,1fr));
    margin-bottom: 2em;
	}

.wrapper2 {
		display: grid;
    border:1px solid #000;
    grid-gap: 10px;
		grid-template-columns: repeat(auto-fit, minmax(200px,1fr));
	}

External CSS

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External JavaScript

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