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HTML 

              
                <p>⬇ Grid lines are the horizontal and vertical dividing lines of the grid.</p>
<main>
	<div>1</div>
	<div class="title">2 
		<h1>CSS Grid Layout</h1>
		<h2>New Terminology</h2>
	</div>
	<div>3</div>
	<div data-grid="grid-column">4
		<p><strong>Grid Track (Column)</strong> A grid track is the space between two adjacent grid lines, forming a grid column or grid row.</p>
	</div>
	<div>5</div>		
	<div data-grid="grid-area">6
		<p><strong>Grid Area</strong> A grid area consists of one or more adjecent grid cells. It is bound by four grid lines, one on each side of the grid area.</p>
	</div>
	<div data-grid="grid-cell">7
		<p><strong>Grid Cell</strong> A grid cell is the smallest unit of the grid. A grid cell is the intersection of a grid row and a grid column.</p> 
	</div>
	<div>8</div>
	<div>9</div>
	<div>10</div>	
	<div>11</div>		
	<div data-grid="grid-row">12
		<p><strong>Grid Track (Row)</strong> A grid track is the space between two adjacent grid lines, forming a grid column or grid row.</p>
	</div>
</main>
!

CSS 

              
                main {
	display: grid;
	grid-gap: 1rem;
	grid-template-columns: repeat(2, 1fr) minmax(50px, 1fr);	
	grid-template-rows: repeat(10, min-content);
	// grid-auto-flow will move cells to fit into grid where gaps are made (resize window to see gaps)
	// grid-auto-flow: dense;
	
	@include bp(large) {
		grid-template-columns: 10vw minmax(50px, 50vw) repeat(2, 1fr);	
		grid-template-rows: repeat(10, min-content);
	}
}

[data-grid='grid-cell'] {
	border-color: rgb(255 0 72);
	
	&:hover {
		background: rgb(255 0 72);
	}
}

[data-grid='grid-column'] {
	border-color: rgba(2 143 118 / 0.8);
	grid-column: 3;
	grid-row: 2 / 9;
	
	@include bp(large) {
		grid-column: 4;
		grid-row: 1 / 6;
	}
	
	&:hover {
		background: rgba(2 143 118 / 0.8);
	}
	
	// Showing overlap
	position: relative;

	&:after {
		background: hsla(0 0% 10% / 0.4);
		bottom: 0;
		color: hsl(0 0% 100%);
		content: "Grid tracks can overlap";
		inset: auto 0 0;
		padding: 0.7rem;
		position: absolute;
	}
}

[data-grid='grid-area'] {
	border-color: rgb(138 0 84);
	grid-column: 1 / span 2;
	grid-row: span 3;
	
	@include bp(large) {
		grid-column: 2;
	}
	
	&:hover {
		background: rgb(138 0 84);
	}
}

[data-grid='grid-row'] {
	background: rgba(255 255 255 / .5);
	border-color: rgba(38 95 163 / .8);
   grid-column: 1 / -1; // -1 jumps to the last grid line to count from the end
	grid-row: 8;
	
	@include bp(large) {
		// declare row to get the overlap
		grid-row: 5;
	}
	
	&:hover {
		background: rgba(38 95 163 / .8);
	}
}

.title {
	grid-column: 1 / -1;
	grid-row: 1;

	@include bp(large) {
		grid-column: 2;
	}
}

// Styles for fun
// -------------------------------------------------
@import url('https://fonts.googleapis.com/css?family=Scope+One|Open+Sans:700');

body {
	background: #fff;
	color: rgb(113 115 136);
	font-family: 'Scope One', sans-serif;
	font-size: 1rem;
	line-height: 1;
	margin: 1rem;	
}

h1, h2 {
	margin: 0;
}

div {
	border: 1px solid #ddd;
	padding: 0.75vw 1vw;
}

h1 {
	color: rgb(113 115 136);
	font-size: 4.5rem;
	font-weight: 700;
	padding-block-start: 0.5rem;
}

h2 {
	color: #999;
	font-size: 1.25rem;	
}

[data-grid]  {
	border-width: 1px;
	border-style: solid;

	&:hover {
		color: white;
	}
}

a {
	color: hsl(23 74% 59%);
}

p {
	line-height: 1.5;
}

strong {
	display: block;
	font-family: "Open Sans", sans-serif;
	font-weight: 700;
	text-transform: uppercase;
}
!

JS
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