JSFiddle - React, Tailwind, and code Playground

HTML

<header>
            <nav>
            <span id="logo"><a href="index.html">LOGO</a></span>
                <ul>
                    <li><a href="#">Home</a></li>
                    <li><a href="#">Blog</a></li>
                    <li><a href="#">Projects</a></li>
                    <li><a href="#">Contact</a></li>
                </ul>
            </nav>
        </header>
        <div id="wrapper">
            <div class="content">
                <div class="leftSide">
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
                    <p>Left</p> 
...

CSS

* {
    margin: 0;
    padding: 0;
}
html, body {
    background: none repeat scroll 0 0 #555555;
    font-family: 'Orienta',sans serif;
    height: 100%;
    width: 100%;
}
#wrapper {
    margin-left: 5%;
    margin-right: 5%;
    width: 90%;
}
header {
    color: #FFFFFF;
}
#logo a {
    font-family: 'Orbitron',sans-serif;
    font-size: 45px;
    margin-left: 25px;
    text-shadow: 0 0 8px #32CF0A;
}
nav {
    background: none repeat scroll 0 0 #1C1B1B;
    float: left;
    font-size: 15px;
    height: 100%;
    width: 100%;
}
nav ul {
    float: right;
    list-style: none outside none;
    margin-right: 75px;
}
nav ul li {
    float: left;
    margin-left: 15px;
    padding: 40px 25px 5px;
}
nav ul li a:hover {
    text-shadow: 0 0 6px #FFFFFF;
}
a {
    color: #FFFFFF;
    text-decoration: none;
}
.content {
    background: none repeat scroll 0 0 #EEEEEE;
    width: 100%;
}
.leftSide {
    background: none repeat scroll 0 0 #FF0000;
    float: left;
    width: 70%;
}
.rightSide {
    background: none repeat scroll 0 0 #0000FF;
    float: right;
    width: 30%;
}
footer {
    clear: both;
    font-size: 10pt;
    height: 180px;
    position: relative;
    width: 100%;
}
.footer {
    background: none repeat scroll 0 0 #343434;
    box-shadow: 0 14px 6px -6px rgba(0, 0, 0, 0.7);
    height: 120px;
    width: 100%;
}
.footerInfo {
    float: left;
    margin-left: 70px;
    margin-top: 20px;
}
.footerInfo h3 {
    color: #43DFD4;
    padding-bottom: 4px;
}
.footerInfo ul {
    list-style: none outside none;
    text-align: center;
}
.footerInfo li a {
    color: #FFFFFF;
}
.footerInfo li a:hover {
    color: #43DFD4;
    text-decoration: underline;
}

JavaScript

$(function(){
    
    var contentHeight = $('.leftSide').height();
    $('.rightSide').height(contentHeight);
    
});