<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>
body {
  margin: 40px;
}

.wrapper {
		display: grid;
    grid-gap: 10px;
		grid-template-columns: [col1-start] 100px  [col2-start] 100px  [col3-start] 100px [col3-end];
		grid-template-rows: [row1-start] auto [row2-start] auto [row2-end];
		background-color: #fff;
		color: #444;
	}

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

	}

	.a {
		grid-column: col1-start / col3-start;
		grid-row: row1-start ;
	}
	.b {
		grid-column: col3-start ;
		grid-row: row1-start / row2-end;
	}
	.c {
		grid-column: col1-start;
		grid-row: row2-start ;
	}
	.d {
		grid-column: col2-start ;
		grid-row: row2-start ;
	}

External CSS

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External JavaScript

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