JSFiddle - React, Tailwind, and code Playground

HTML

<div class="navbar">
        <span class="nav-btn"></span>
        <div class="container">

            <div id="brand">
                <img src="Img/logo1.png" class="visible" />
                <img src="Img/smallLogo.png" class="hidden" />
            </div>
            <nav>
                <ul>
                    <li>
                        <a href="#">
                            <img src="Img/home2.png" height="20" /></a>
                    </li>
                    <li><a href="#">HOTEL</a></li>
                    <li><a href="#">TOURS</a></li>
                    <li class="dropdown"><a href="#">EUROPE MAIL</a><img src="Img/arrowDown.png" />
                        <ul class="dditems">
                            <li><a href="EuropeRail.html">Europe Rail</a></li>
                            <li><a href="EuropeRailWorld.html">Europe Rail World</a></li>
                        </ul>
                    </li>
                    <li class="dropdown"><a href="#">VACATIONS</a><img src="Img/arrowDown.png" />
                        <ul class="dditems">
                            <li><a href="Vocation.html">Cheap Caribbean</a></li>
                            <li><a href="Hurtigruten.html">Hurtigruten</a></li>
                            <li><a href="Contiki.html">Contiki</a></li>
                            <li><a href="Sandals.html">Sandals</a></li>
                        </ul>
                    </li>
                    <li class="dropdown"><a href="#">HOME RENTALS</a><img src="Img/arrowDown.png" />
                        <ul class="dditems">
                            <li><a href="HomeRental.html">Vacation Home Rentals</a></li>
                            <li><a href="HomeExchange.html">Home For Exchange</a></li>
                            <li><a href="HomeAway.html">Home Away Europe</a></li>
                        </ul>
                    </li>
                    <li><a href="#">CRUISE</a></li>
                    <li><a...

CSS

html {
            font-family: sans-serif;
            -webkit-text-size-adjust: 100%;
            -ms-text-size-adjust: 100%;
        }

        * {
            margin: 0px;
            padding: 0px;
        }

        .container {
            padding-right: 25px;
            padding-left: 100px;
            margin-right: auto;
            margin-left: auto;
            text-align: center;
        }


        .navbar {
            background: #333333;
            height: 50px;
            position: fixed;
            width: 100%;
            margin: 0 auto;
        }

        #brand {
            float: left;
            padding-right: 30px;
            padding-top: 10px;
        }

        .hidden {
            display: none;
        }

        .visible {
            display: block;
        }

        nav {
            width: 100%;
            text-align: center;
        }

            nav ul {
                float: left;
                line-height: 50px;
                padding: 0px;
                margin: 0px;
                position: relative;
            }

                nav ul li {
                    display: inline-block;
                    list-style-type: none;
                }

                    nav ul li a {
                        text-decoration: none;
                        padding: 10px;
                        color: #9d9d9d;
                        font-size: 14px;
                    }

                    nav ul li:hover {
                        background-color: #333;
                    }

                    nav ul li a:hover {
                        color: #fff;
                    }

                    nav ul li:hover ul {
                        display: block;
                    }

                nav ul ul {
                    display: none;
                    position: absolute;
                    background-color: #333;
                    min-width: 150px;
                }

                    nav ul ul li {
   ...

JavaScript

$(document).ready(function () {
            $("span.nav-btn").click(function () {
                $("nav").slideToggle();
            });
        });
        $(document).ready(function () {
            var mainmenu = $(this).next('ul');
            $(".dropdown").click(function () {
                $(this).children(".dditems").slideToggle();
            });
        });