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HTML

            
              <div class="container">
  <div class="item box-big1">A</div>
  <div class="item box-big6">B</div>
  <div class="item">C</div>
  <div class="item">D</div>
  <div class="item">E</div>
  <div class="item box-big2">F</div>
  <div class="item box-big3">G</div>
  <div class="item">H</div>
  <div class="item">I</div>
  <div class="item">J</div>
  <div class="item box-big4">K</div>
</div>
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CSS

            
              .item {
  background: #ddd;
  padding: 10px;
  border-radius: 4px;
}
.container{
	display: grid;
	grid-gap: 10px;
	grid-template-columns: 1.5fr 1fr 1fr 3fr;
	grid-template-rows: 180px 100px 80px 120px auto;
}
.box-big1{
	grid-column: 1;
	grid-row: 1 / span 3;
	background: #F6D580;
}
.box-big2{
	grid-column: 3 / 5;
	background: #6BBED5;
}
.box-big3{
	grid-column: 2 / 4;
	grid-row: 3 / 5;
	background: #C97FB4;
}
.box-big4{
	grid-column: 1 / span 4;
	grid-row: auto;
	background: #64C99B;
}
@media (max-width: 600px){
	.container{
		grid-template-columns: 1fr;
		grid-template-rows: auto;
	}
	.box-big1,.box-big2,.box-big3,.box-big4{
		grid-column: 1;
		grid-row: auto;
	}
}
!

JS
!
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