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HTML

              
                <div class="wrapper">

	<header>
		<h1>3 Column Responsive Layout</h1>
	</header>
		
<section class="columns">
	
	<div class="column">
		<h2>1st Content Area</h2>
		<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Sequi ratione architecto necessitatibus cum praesentium dolor totam voluptatibus recusandae?</p>
	</div>
	
	<div class="column">
		<h2>2nd Content Area</h2>
		<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Sequi ratione architecto necessitatibus cum praesentium dolor totam voluptatibus recusandae? Illo quod nemo ratione itaque dolores laudantium error vero laborum blanditiis nostrum.</p>
	</div>
  
  <div class="column">
		<h2>3rd Content Area</h2>
		<p>Illo quod nemo ratione itaque dolores laudantium error vero laborum blanditiis nostrum. Lorem ipsum dolor sit amet consectetur adipisicing elit. Sequi ratione architecto cum praesentium voluptatibus recusandae?</p>
	</div>
	
</section>	
	
	<footer>
		<h3>Footer</h3>
		<p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Ipsam, porro. Doloribus vitae non dolores modi dolorum commodi perspiciatis dicta nostrum minus esse, totam officia, quibusdam amet quas tempora? Voluptatibus, esse.</p>
	</footer>

</div>
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Open+Sans);

* { box-sizing: border-box; }

body { 
  font-family: 'Open Sans', sans-serif;
  color: #666;
}

/* STRUCTURE */

.wrapper {
	padding: 5px;
	max-width: 960px;
	width: 95%;
	margin: 20px auto;
}
header {
	padding: 0 15px;
}

.columns {
	display: flex;
	flex-flow: row wrap;
	justify-content: center;
	margin: 5px 0;
}

.column {
	flex: 1;
	border: 1px solid gray;
	margin: 2px;
	padding: 10px;
	&:first-child { margin-left: 0; }
	&:last-child { margin-right: 0; }
	
}

footer {
	padding: 0 15px;
}


@media screen and (max-width: 980px) {
  .columns .column {
		margin-bottom: 5px;
    flex-basis: 40%;
		&:nth-last-child(2) {
			margin-right: 0;
		}
		&:last-child {
			flex-basis: 100%;
			margin: 0;
		}
	}
}

@media screen and (max-width: 680px) {
	.columns .column {
		flex-basis: 100%;
		margin: 0 0 5px 0;
	}
}
              
            
!

JS

              
                /*
Note: You can easily create additional columns by adding more elements with the class of 'column' inside the 'columns' div. e.g.:

...
<div class="column">
  <h2>4th column</h2>
</div>
<div class="column">
  <h2>5th column</h2>
</div>

*/
              
            
!
999px

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