JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
 <div class="container">
        <div class="site-box">
            <div class="container-fluid">
                <div class="row">
                    <div class="header">
                        <!-- HEADER -->
                        <!-- Logo -->
                        <div class="col-xs-3 col-md-3">
                            <div class="header-logo">
                                <span class="logo">Zikle</span>
                            </div>
                        </div>
                        <!-- Search -->
                        <div class="col-md-6 hidden-xs hidden-sm">
                            <div class="header-search">
                                <div class="input-group">
                                    <form class="header-search-form" role="search">
                                        <input type="text" class="form-control" placeholder="Zoeken..." aria-label="Zoeken">
                                        <span class="input-group-btn" id="basic-addon1"><button class="btn btn-default" type="button"><span class="glyphicon glyphicon-search"></span></button></span>
                                    </form>
                                </div>
                            </div>
                        </div>
                        <!-- Control Panel -->
                        <div class="col-xs-9 col-md-3">
                            <div class="header-controlpanel"><div class="pull-right">
                                <span><kbd>Dani&euml;l</kbd></span> <img src="http://www.zikle.nl/userfiles/thumbs/0/2/5/4/02546700.png" width=40 height=40 style="border-radius: 50%; cursor: pointer">
                            </div></div>
                        </div>

                    </div>
                </div>

                <div class="row">
                    <!-- Left MENU -->
                    <div class="col-md-3...

CSS

html {
    color: #222;
    font-size: 1em;
    line-height: 1.4;
}

/*
 * Remove text-shadow in selection highlight:
 * https://twitter.com/miketaylr/status/12228805301
 *
 * These selection rule sets have to be separate.
 * Customize the background color to match your design.
 */

::-moz-selection {
    background: #b3d4fc;
    text-shadow: none;
}

::selection {
    background: #b3d4fc;
    text-shadow: none;
}

/*
 * A better looking default horizontal rule
 */

hr {
    display: block;
    height: 1px;
    border: 0;
    border-top: 1px solid #ccc;
    margin: 1em 0;
    padding: 0;
}

/*
 * Remove the gap between audio, canvas, iframes,
 * images, videos and the bottom of their containers:
 * https://github.com/h5bp/html5-boilerplate/issues/440
 */

audio,
canvas,
iframe,
img,
svg,
video {
    vertical-align: middle;
}

/*
 * Remove default fieldset styles.
 */

fieldset {
    border: 0;
    margin: 0;
    padding: 0;
}

/*
 * Allow only vertical resizing of textareas.
 */

textarea {
    resize: vertical;
}

/* ==========================================================================
   Browser Upgrade Prompt
   ========================================================================== */

.browserupgrade {
    margin: 0.2em 0;
    background: #ccc;
    color: #000;
    padding: 0.2em 0;
}

/* ==========================================================================
   Zikle
   ========================================================================== */

body, html {
        width: 100%;
        height: 100%;
        overflow: none;
        margin-top: 2em;
}

body {
        font-size: 14px;
        font-family: Roboto,arial,sans-serif;
        color: #111;
        background-image: url("../img/bg-pattern.gif");
}

body, div, h1, h2, h3, h4, h5, h6, p, ul, ol, li, dl, dt, dd, img, form, fieldset, input, textarea, blockquote {
        margin: 0; padding: 0; border: 0;
}

.site-box {
        background: #fff;
        border: 1px solid #eee;
       ...

JavaScript

$(function() {
    
    function setHeight(elementToResize, elementToMatch){
		$(elementToResize).height(elementToMatch.height());
	}
    
    //On initial load, resize sidebar
    setHeight($('.side-menu'),$('.right-content-box'));
    
    //On window resize, resize the sidebar
    $(window).resize(function(){
        setHeight($('.side-menu'),$('.right-content-box'));
    });
    
});