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<div class="container">

	<!-- Equal height columns -->

	<div>...</div>
	<div>...</div>
	<div>...</div>
	
</div>

.container {
        /* Initialize the flex model */
	display: flex;

        /* These are the default values but you can set them anyway */
	flex-direction: row;    /* Items inside the container will be positioned horizontally */
        align-items: stretch;   /* Items inside the container will take up it's entire height */
}

http://tutorialzine.com/2016/04/5-flexbox-techniques-you-need-to-know-about/