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HTML 

              
                <a class="skip-link screen-reader-text" href="#content">Skip to content</a>

<header class="masthead">
  <div class="logo">G</div>
  <h2 class="site-title">is for Grid</h2>
  <img src="https://source.unsplash.com/vMRMYoLQzwo" alt="A man and a woman standing in the water of the Oslo fjord.">
</header><!-- .masthead -->

<main id="content" class="main-area">
  <section class="splash grid">
    <div class="splash-content">
      <h2 class="content-title">Full Bleed CSS Grid</h2>
      <div class="splash-text">
        <p>CSS Grid provides a trivial solution to a complex problem: How to display full-bleed content mixed with center-aligned width-constrained content. This solution elimiates the need for auto-margins and floats while allowing the developer to change the grid globally and see those changes apply to each element individually.</p>
      </div><!-- .splash-text -->
    </div><!-- .splash-content -->
  </section><!-- .splash -->

  <section class="buckets grid">
    <ul>
      <li>
        <img src="https://source.unsplash.com/KUfkX6gVwBU/600x400" alt="">
        <div class="bucket">
          <h3 class="bucket-title">Grid is great</h3>
          <p>CSS Grid is a two-dimensional layout tool. It is great for layout out content in a grid, and for laying out content in two dimensions.</p>
        </div><!-- .bucket -->
      </li>
      <li>
        <img src="https://source.unsplash.com/w3lQVmuK8fw/600x400" alt="">
        <div class="bucket">
          <h3 class="bucket-title">Flex is great too</h3>
          <p>That said, Grid is not always the right option for layuts. If for example you need to lay out a series of identical boxes like those you see here, Flex may be a better option.</p>
        </div><!-- .bucket -->
      </li>
      <li>
        <img src="https://source.unsplash.com/1jKjJjGgDG8/600x400" alt="">
        <div class="bucket">
          <h3 class="bucket-title">Know what tool to use</h3>
          <p>In some cases Grid and Flex are interchangeable. In other cases one is definitely better than the other. The choice usually comes down to whether you are laying out a list of items (Flex) or creating a more nuanced layout (Grid).</p>
        </div><!-- .bucket -->
      </li>
    </ul>
  </section><!-- .buckets -->

  <section class="more grid">
    <div class="more-content">
      <h2 class="content-title">Subgrid would be nice here</h2>
      <p>The solution provided here is limited by the lack of support for subgrids. If subgrids were available, the solution would be more refined. In lieu of subgrid, the solution applies a grid to each full-bleed section within the layout using a common class <code>.grid</code> and creates the full-bleed/centered effect that way.<p>
    </div><!-- .more-content -->
  </section><!-- .more -->

  <section class="twins grid">
    <div class="twin">
      <h2 class="content-title">Grid lets you do unusual things</h2>
      <p>Creating this layout, where two items share the total available viewport width evenly alongside full-width and centered content, is suprisingly complex if you don't have CSS Grid available.</p>
    </div>
    <div class="twin">
      <h2 class="content-title">Grid requires a rethink</h2>
      <p>Seeing this layout you may still think it's better to just use old methods with auto-margins and max-widths. And you <em>can</em>, but looking at the CSS you'll see the Grid approach is both cleaner and easier to understand.</p>
    </div>
  </section><!-- .twins -->
</main>

<footer class="colophon grid">
  <aside>Content, layout, design: <a href="https://twitter.com/mor10" target="_blank" rel="nofollow">Morten Rand-Hendriksen</a>.</aside>
  <aside>All photos: <a href="https://unsplash.com/@andozo" target="_blank" rel="nofollow">Andreas Rønningen</a>.</aside>
</footer>
!

CSS 

              
                /* NOTE:
 * Grid/Flex layout stuff starts at line 187. 
 * The stuff before is just boring old CSS to make content look not crappy.
 */


/*--------------------------------------------------------------
CSS Reset
--------------------------------------------------------------*/
html {
	font-family: sans-serif;
	-webkit-text-size-adjust: 100%;
	-ms-text-size-adjust:     100%;
}

body {
	margin: 0;
}

img {
	display: block;
	border: 0;
	width: 100%;
	height: auto;
}


/*--------------------------------------------------------------
Accessibility
--------------------------------------------------------------*/
/* Text meant only for screen readers */
.screen-reader-text {
	clip: rect(1px, 1px, 1px, 1px);
	position: absolute !important;
	height: 1px;
	width: 1px;
	overflow: hidden;
}

.screen-reader-text:hover,
.screen-reader-text:active,
.screen-reader-text:focus {
	background-color: #f1f1f1;
	border-radius: 3px;
	box-shadow: 0 0 2px 2px rgba(0, 0, 0, 0.6);
	clip: auto !important;
	color: #21759b;
	display: block;
	font-size: 14px;
	font-weight: bold;
	height: auto;
	left: 5px;
	line-height: normal;
	padding: 15px 23px 14px;
	text-decoration: none;
	top: 5px;
	width: auto;
	z-index: 100000; /* Above WP toolbar */
}


/*--------------------------------------------------------------
Typography
--------------------------------------------------------------*/
body,
button,
input,
select,
textarea {
	color: #404040;
	font-family: 'Helvetica', Arial, sans-serif;
	font-size: 18px;
	line-height: 1.5;
}

h1,
h2,
h3 {
	text-align: center;
	margin: 0;
	padding: 1em 0;
}

p {
	margin: 0;
	padding: 1em 0;
}




/* Promo section */

.logo,
.site-title {
	text-align: center;
}

.logo {
	font-size: 8em;
}

.site-title {
	margin-top: -1em;
	margin-bottom: 3em;
}

/* Splash section */

.splash {
	background: #FFF6E5;
	padding-bottom: 2em;
}

.splash-content {
	padding: 1.5em;
}

@media screen and (min-width: 600px) {
	.splash-text {
		columns: 2;
		column-gap: 2em;
	}

	.splash-text p {
		padding-top: 0;
	}
}

/* Buckets section */

.buckets {
	padding: 2em 1em 1em;
	background: #3E454C;
}

.buckets ul {
	margin: 0;
	padding: 0;
}

.buckets li {
	margin-bottom: 1em;
	background: white;
	list-style-type: none;
}

.bucket {
	padding: 1.5em;
}

/* More section */

.more {
	padding: 2em;
}

/* Twins section */

.twin {
	padding: 2em;
	background: #2185C5;
	color: white;
}

.twin:last-of-type {
	background: #FF7F66;
}

/* Colophon section */
.colophon {
	padding: 2em;
	background: hsl(0, 0%, 10%);
	color: white;
	text-align: center;
}

.colophon a {
	color: white;
}

.colophon a:hover,
.colophon a:focus {
	border-bottom: 1px solid white;
}

/*--------------------------------------------------------------
If no grid support, limit width to 50em and center align
--------------------------------------------------------------*/
@supports not (display: grid) {
	.grid {
		max-width: 50em;
		margin: 0 auto;
	}
}

/*--------------------------------------------------------------
Use flex to create a three-bucket layout 
--------------------------------------------------------------*/

@media screen and (min-width: 700px) {
	@supports (display: flex) {

		.buckets ul {
			display: flex;
			justify-content: space-around;
		}

		.buckets li {
			width: 31%;
		}

	}
}

/*--------------------------------------------------------------
CSS Grid layout for wider screens, when browser supports grid:
--------------------------------------------------------------*/

@media screen and (min-width: 600px) {
	/* Layout with CSS Grid */
	@supports (display: grid) {

		/* Four-column layout. Two center columns have a total max width of 50em: */
		.grid {

			display: grid;
			grid-template-columns: 1fr repeat(2, minmax(auto, 25em)) 1fr;
		}

		/* Center items by placing them in the two center columns: */
		.splash-content,
		.more-content,
		.buckets ul {
			grid-column: 2/4;
		}

		/* Use automatic grid placement + span to let each item span two columns:*/
		.twin,
		.colophon aside {
			grid-column: span 2;
		}

	}
}
!

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