JSFiddle - React, Tailwind, and code Playground

HTML

<div id="cssmenu">
        <li><a href="index.html">HTML</a></li>
        <li><a href="about.html">about</a></li>
        <li><a href="portfolio.html">portfolio</a></li>
</div>

    <div id="wrapper"> 

    <div id="content">    	
        <h2>Welcome!</h2>
        <p> ajax functionality so that the content loads into the relevant container instead of the user having to navigate to another page some awesome effects...</p>
    </div>
</div>

CSS

#wrapper {
    border:1px solid green;
    position:relative;
    
}
#cssmenu {
  background: #333;
  list-style: none;
width:120px;
}
#cssmenu li {
  
  margin: 0;
  padding: 0;
  list-style: none;
  width:120px;
}
#cssmenu a {
  background: #333;
  border-bottom: 1px solid #393939;
  color: #ccc;
  display: block;
  padding: 8px 2px;
  text-decoration: none;
  font-weight: normal;
}
#cssmenu a:hover {
  background: #2580a2;
  color: #fff;

}




#load {
	display: none;
	position: absolute;
	right: 50%;
	top: 50%;
	background: url(http://i.imgur.com/fhiyJSJ.gif);
	width: 43px;
	height: 11px;
    margin-left:-21px;
    margin-top:-5px;
	text-indent: -9999em;
}

#content {
}

JavaScript

$(document).ready(function() {
						   
	var hash = window.location.hash.substr(1);
	var href = $('#cssmenu li a').each(function(){
		var href = $(this).attr('href');
		if(hash==href.substr(0,href.length-5)){
			var toLoad = hash+'.html #content';
			$('#content').load(toLoad)
		}											
	});

	$('#cssmenu li a').click(function(){
								  
		var toLoad = $(this).attr('href')+' #content';
		$('#content').hide('fast',loadContent);
		$('#load').remove();
		$('#content').append('<span id="load">LOADING...</span>');
        $('#content').fadeIn(1000);
		$('#load').fadeIn('normal');
		window.location.hash = $(this).attr('href').substr(0,$(this).attr('href').length-5);
		function loadContent() {
			$('#content').load(toLoad,'',showNewContent())
		}
		function showNewContent() {
			$('#content').show('normal',hideLoader());
		}
		function hideLoader() {
			$('#load').fadeOut('normal');
		}
		return false;
		
	});

});