JSFiddle - React, Tailwind, and code Playground

HTML

Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla

<div id="menu_wrapper">
<div class="table">
	<ul id="menu">
    	<li class="cat">Categories ></li>
		<li><a href="#aboutus">About us</a></li>
		<li><a href="#hospitality">Hospitality</a> </li>
		<li><a href="#property">Property</a> </li>
	</ul>
</div>
</div>

<div id="aboutus">
Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum. Typi non habent claritatem insitam; est usus legentis in iis qui facit eorum claritatem. Investigationes demonstraverunt lectores legere me lius quod ii legunt saepius. Claritas est etiam processus dynamicus, qui sequitur mutationem consuetudium lectorum. Mirum est notare quam littera gothica, quam nunc putamus parum claram, anteposuerit litterarum formas humanitatis per seacula quarta decima et quinta decima. Eodem modo typi, qui nunc nobis videntur parum clari, fiant sollemnes in futurum. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. 
</div>
   ...

CSS

#menu_wrapper { position:relative; width:100%; margin: 0px auto; padding:0 6%; height: auto; -webkit-box-shadow: 0 20px 20px -20px black; -moz-box-shadow: 0 20px 20px -20px black; box-shadow: 0 20px 20px -20px #262626; background-color:#222; -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; z-index:99 }
.table { display: table;   /* Allow the centering to work */margin: 0 auto; top:-3px; position:relative; }
#menu-icon { display: none; /* hide menu icon initially */}
#menu, #menu li { margin:0; padding:0; list-style: none; float: left; }
#menu li { font-family: 'Open Sans', sans-serif; font-size:14px; font-weight:800; text-transform:uppercase;  border-top:3px solid #2f2f2f; -webkit-transition: all 0.2s; -moz-transition: all 0.2s; -o-transition: all 0.2s; -ms-transition: all 0.2s; transition: all 0.2s; }
#menu li a { font-family: 'Open Sans', sans-serif; font-size:14px; font-weight:800; text-transform:uppercase; text-decoration: none; color: #d8d8d8; display:block; padding: 14px; margin:0 2px; cursor:pointer; -webkit-transition: all 0.2s; -moz-transition: all 0.2s; -o-transition: all 0.2s; -ms-transition: all 0.2s; transition: all 0.2s; }
#menu li:hover { border-top:3px solid #df3d3d; color:#df3d3d }
#menu li a:hover { color:#df3d3d }
#menu li.current { border-top:3px solid #df3d3d; color:#df3d3d }
#menu li.cat { padding: 14px; }
#menu li.cat:hover { border-top:3px solid #2f2f2f; color:#555 }



@media screen and (min-width: 767px) {

	/* ensure #nav is visible on desktop version */
	#menu { display: block !important;}


}




@media (max-width: 767px) {

.header { text-align:center }
.header .details { position:relative; display:block; padding: 15px 6%; margin-bottom:30px; background:#2c2c2c; font-size:17px; font-family: 'Lato', Arial; color:#bbb;}
H1 { margin: 0 0 5px 0;  display:block; float:none }
.header .details .tel { position:relative; display:inline-block; float:none; padding-left:35px; background:url(icon-phone.png)...

JavaScript

jQuery(document).ready(function($){
	$('#menu_wrapper').prepend('<div id="menu-icon">Menu</div>');
	$("#menu-icon").on("click", function(){
		$("#menu").slideToggle();
		$(this).toggleClass("active");
	});
    $('#menu li a').on("click", function(){
        $('#menu').slideUp();
    });
});








"use_strict";

var Shira;
(function (Shira, $) {
    (function (ScrollFix) {
        /**
         * @constructor
         *
         * @param {HTMLElement} element DOM element that is going to be fixed
         * @param {Object}      options option map
         */
        ScrollFix.Watcher = function (element, options) {
            this.element = element;
            this.options = $.extend({}, ScrollFix.Watcher.defaults, options);
        };

        ScrollFix.Watcher.defaults = {
            syncSize: true,
            syncPosition: true,
            fixClass: 'scroll-fix',
            fixTop: 0,
            fixOffset: 0,
            unfixOffset: 0,
            onUpdateFixed: null
        };

        ScrollFix.Watcher.prototype = {
            element: null,
            substitute: null,
            options: null,
            fixed: false,
            attached: false,

            /**
             * Get absolute X position of the given element
             *
             * @param {HTMLElement} elem
             * @returns {Number}
             */
            getElementX: function (elem) {
                var x = 0;
                do x += elem.offsetLeft;
                while (elem = elem.offsetParent);

                return x;
            },

            /**
             * Get absolute Y position of the given element
             *
             * @param {HTMLElement} elem
             * @returns {Number}
             */
            getElementY: function (elem) {
                var y = 0;
                do y += elem.offsetTop;
                while (elem = elem.offsetParent);

                return y;
            },

            /**
             * Fix the...