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Standard grid-based 3-column layout with 2-column option

A Pen By Morten Rand-Hendriksen

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HTML

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

    <header class="masthead">
        <h2 class="site-title">Standard two-column layout</h2>
    </header><!-- .masthead -->

    <main id="content" class="main-content">
        <h2>Main content area</h2>
        <p>The main content area is where the magic happens. Right now, the main content is on the left and the sidebar is on the right. If you go into the markup for this document and add <code>dir="rtl"</code> to the <code>html</code> element, the two elements will swap spaces because CSS Grid honors text direction.</p>
    </main>

    <aside class="sidebar">
        <h3>The Sidebar</h3>
        <p>The sidebar typically contains things like:</p>
        <ul>
            <li>Links</li>
            <li>Menus</li>
            <li>Ads</li>
        </ul>
    </aside>

    <aside class="twin">
        This should take up half the space
    </aside>
    <aside class="twin">
        This should take up the other half of the space
    </aside>

    <footer class="colophon grid">
        <aside>Content, layout, design: <a href="https://twitter.com/mor10" target="_blank" rel="nofollow">Morten Rand-Hendriksen</a>.</aside>
    </footer>

</div>
!

CSS

            
              /* NOTE:
 * Grid layout stuff starts at line 138. 
 * 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 {
	margin: 0;
	padding: 1em 0;
}

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

/*--------------------------------------------------------------
General styles
--------------------------------------------------------------*/
.site {
	background: #ededed;
	min-height: 100vh;
}

.masthead,
.main-content,
.sidebar,
.twin,
.footer {
	padding: 1em 2em;
}

.main-content {
	background: white;
}
.masthead {
	background: #2185C5;
	color: white;
}

.sidebar {
	background: #FF7F66;
}

.twin {
	background: #2185C5;
}

.twin:last-of-type {
	background: #7ECEFD;
}

.colophon {
	padding: 2em;
	background: #3E454C;
	color: white;
}

.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) {
	.site {
		max-width: 50em;
		margin: 0 auto;
	}
}

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

@media screen and (min-width: 600px) {
	@supports (display: grid) {

		.site {
			display: grid;
			grid-template-columns: 1fr repeat(6, minmax(auto, 10em)) 1fr;
			grid-template-rows: minmax(1em, auto) 1fr auto minmax(1em, auto);
		}

		.masthead,
		.colophon {
			grid-column: span 8;
		}

		.main-content {
			grid-column: 2/6;
		}

		.sidebar {
			grid-column: 6/8;
		}

		.twin {
			grid-column: 2/5;
			grid-row: 3/4;
		}

		.twin:last-of-type {
			grid-column: 5/8;
		}

	}
}
!

JS
!
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