<div class="wrapper">
  <div class="box a">A</div>
  <div class="box b">B</div>
  <div class="box c">C</div>
  <div class="box d">D</div>
  <div class="box e">E</div>
  <div class="box f">F</div>
  <div class="box g">G</div>
  <div class="box h">H</div>
  <div class="box i">I</div>
</div>
body {
  margin: 40px;
}
.wrapper {
		display: grid;
    grid-gap: 10px;
		grid-template-columns: repeat(auto-fill, minmax(200px, 1fr) ) ;
		background-color: #fff;
		color: #444;
	}

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

	}
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