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CSS

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JavaScript

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HTML 

              
                <div class="grid">
	<div class="grid__item grid__item--heading">
		<h1>Heading</h1>
	</div>
	<div class="grid__item grid__item--body">
		<p>Body</p>
	</div>
	<div class="grid__item grid__item--fig">
		<p>Something else</p>
	</div>
</div>

<div class="grid">
	<div class="grid__item grid__item--fw">
		<p>Content that fits the wrapper – basically a full-width grid item</p>
	</div>
</div>

<div class="grid">
	<div class="grid__item grid__item--heading">
		<h1>Heading</h1>
	</div>
	<div class="grid__item grid__item--body-right">
		<p>Body</p>
	</div>
	<div class="grid__item grid__item--fig-to-edge">
		<p>A figure that bleeds to the edge of the page</p>
	</div>
</div>
!

CSS 

              
                * {
	box-sizing: border-box;
}

:root {
	--wrapper: 100%;
	--col: 1fr;
	--pad: 20px;
	--gutter: 20px;
	--numberOfColumns: 22;
	
	@media (min-width: 1200px) {
		--numberOfColumns: 22;
		--wrapper: 1000px;
		--pad: 1fr;
		--col: calc((var(--wrapper) - ((var(--numberOfColumns) + 1) * var(--gutter))) / var(--numberOfColumns));
	}
	
	@media (min-width: 1600px) {
		--wrapper: 1400px;
	}
}

body {
	background-color: #787A63;
}


.grid {
	max-width: 1200px;
	margin: 40px auto;
	padding: 0 20px;
	
	@media (min-width: 600px) {
		display: flex;
		
		@supports (display: grid) {
			display: grid;
			grid-template-columns: [outer-start] var(--pad) [wrapper-start inner-start] repeat(var(--numberOfColumns), var(--col)) [wrapper-end inner-end] var(--pad) [outer-end];
			grid-template-rows: minmax(auto, 300px);
			grid-gap: var(--gutter);
			max-width: none;
			padding: unset;
			
			&::after,
			&::before {
				content: '';
				display: block;
				width: 100%;
				height: 100%;
				grid-row: 1 / 4;
				opacity: 0.2;
			}
			
			&::after {
				border: 2px dotted black;
				grid-column: wrapper-start / wrapper-end;
			}
			
			&::before {
				content: '';
				display: block;
				width: 100%;
				height: 100%;
				border: 2px solid #F8E8D5;
				grid-column: inner-start / inner-end;
			}
		}
	}
	
	@media (min-width: 1200px) {
		grid-template-columns: [outer-start] var(--pad) [wrapper-start] 1fr [inner-start] repeat(var(--numberOfColumns), var(--col)) [inner-end] 1fr [wrapper-end] var(--pad) [outer-end];
	}
}

.grid__item {
	width: 100%;
	min-height: 200px;
	padding: 20px;
}

.grid__item--heading {
	grid-column: wrapper-start / wrapper-end;
	grid-row: 1;
	background-color: #2E3D34;
	color: #D2C0A7;
}

.grid__item--body {
	grid-column: inner-start / span 12;
	grid-row: 2;
	background-color: #69623B
}

.grid__item--body-right {
	grid-column: span 12 / inner-end;
	grid-row: 2;
	background-color: #69623B
}

.grid__item--fig {
	grid-column: span 16 / inner-end;
	height: 400px;
	grid-row: 3;
	background-color: #D2C0A7;
}

.grid__item--fig-to-edge {
	grid-column: outer-start / 18;
	height: 400px;
	grid-row: 3;
	background-color: #D2C0A7;
}

.grid__item--fw {
	grid-column: wrapper-start / wrapper-end;
	grid-row: 1;
}
!

JS
!
999px

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