functions.php

<?php

/**
 * Enqueue Scripts
 *
 */
function be_enqueue_scripts() {
	wp_enqueue_script( 'matchHeights', get_stylesheet_directory_uri() . '/js/jquery.matchHeights-min.js', array( 'jquery' ), '0.5.2', true );
	wp_enqueue_script( 'be-global', get_stylesheet_directory_uri() . '/js/global.js', array( 'jquery', 'matchHeights' ), '1.0', true );
}
add_action( 'wp_enqueue_scripts', 'be_enqueue_scripts' );

global.js

jQuery(document).ready(function($){
  $('.content, .sidebar').matchHeight();
});

jquery.matchHeight-min.js

/**
* jquery.matchHeight-min.js v0.5.2
* http://brm.io/jquery-match-height/
* License: MIT
*/
(function(d){var g=-1,e=-1,n=function(a){var b=null,c=[];d(a).each(function(){var a=d(this),k=a.offset().top-h(a.css("margin-top")),l=0<c.length?c[c.length-1]:null;null===l?c.push(a):1>=Math.floor(Math.abs(b-k))?c[c.length-1]=l.add(a):c.push(a);b=k});return c},h=function(a){return parseFloat(a)||0},b=d.fn.matchHeight=function(a){if("remove"===a){var f=this;this.css("height","");d.each(b._groups,function(a,b){b.elements=b.elements.not(f)});return this}if(1>=this.length)return this;a="undefined"!==
typeof a?a:!0;b._groups.push({elements:this,byRow:a});b._apply(this,a);return this};b._groups=[];b._throttle=80;b._maintainScroll=!1;b._beforeUpdate=null;b._afterUpdate=null;b._apply=function(a,f){var c=d(a),e=[c],k=d(window).scrollTop(),l=d("html").outerHeight(!0),g=c.parents().filter(":hidden");g.css("display","block");f&&(c.each(function(){var a=d(this),b="inline-block"===a.css("display")?"inline-block":"block";a.data("style-cache",a.attr("style"));a.css({display:b,"padding-top":"0","padding-bottom":"0",
"margin-top":"0","margin-bottom":"0","border-top-width":"0","border-bottom-width":"0",height:"100px"})}),e=n(c),c.each(function(){var a=d(this);a.attr("style",a.data("style-cache")||"").css("height","")}));d.each(e,function(a,b){var c=d(b),e=0;f&&1>=c.length||(c.each(function(){var a=d(this),b="inline-block"===a.css("display")?"inline-block":"block";a.css({display:b,height:""});a.outerHeight(!1)>e&&(e=a.outerHeight(!1));a.css("display","")}),c.each(function(){var a=d(this),b=0;"border-box"!==a.css("box-sizing")&&
(b+=h(a.css("border-top-width"))+h(a.css("border-bottom-width")),b+=h(a.css("padding-top"))+h(a.css("padding-bottom")));a.css("height",e-b)}))});g.css("display","");b._maintainScroll&&d(window).scrollTop(k/l*d("html").outerHeight(!0));return this};b._applyDataApi=function(){var a={};d("[data-match-height], [data-mh]").each(function(){var b=d(this),c=b.attr("data-match-height")||b.attr("data-mh");a[c]=c in a?a[c].add(b):b});d.each(a,function(){this.matchHeight(!0)})};var m=function(a){b._beforeUpdate&&
b._beforeUpdate(a,b._groups);d.each(b._groups,function(){b._apply(this.elements,this.byRow)});b._afterUpdate&&b._afterUpdate(a,b._groups)};b._update=function(a,f){if(f&&"resize"===f.type){var c=d(window).width();if(c===g)return;g=c}a?-1===e&&(e=setTimeout(function(){m(f);e=-1},b._throttle)):m(f)};d(b._applyDataApi);d(window).bind("load",function(a){b._update(!1,a)});d(window).bind("resize orientationchange",function(a){b._update(!0,a)})})(jQuery);