flexbox

<script src="<?php echo get_stylesheet_directory_uri(); //flexbox?>/d/js/flexibility.js"></script>

.container {
-js-display: flex;
display: flex;
align-contents: stretch;
}

具体

.before_after_box{
	-js-display: flex;
	 display: flex;

http://www.webcreatorbox.com/tech/ie8-flexbox/
http://www.webcreatorbox.com/tech/flexbox/
http://cosao.net/archives/8246