<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">
    <div class="box e">E</div>
    <div class="box f">F</div>
    <div class="box g">G</div>
  </div>
</div>

body {
  margin: 40px;
}

	.wrapper {
		display: grid;
    grid-gap: 10px;
		grid-template-columns: repeat(4, [col] 150px ) ;
		grid-template-rows: repeat(2, [row] auto  );
		background-color: #fff;
		color: #444;
	}

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

	}

	.box .box {
		background-color: #ccc;
		color: #444;
	}

	.a {
		grid-column: col / span 2;
		grid-row: row;
	}

	.b {
		grid-column: col 3 / span 2;
		grid-row: row;
	}

	.c {
		grid-column: col / span 2;
		grid-row: row 2;
	}

	.d{
		grid-column: col 3 / span 2;
		grid-row: row 2;
		display: grid;
    grid-gap: 10px;
		grid-template-columns: 1fr 1fr;
	}

	.e {
		grid-column: 1 / 3;
		grid-row: 1;    
	}

	.f {
		grid-column: 1;
		grid-row: 2;
	}

	.g {
		grid-column: 2;
		grid-row: 2;
	}