JSFiddle - React, Tailwind, and code Playground

HTML

<header>
  <nav id='cssmenu'>

    <div id="head-mobile"></div>
    <div class="button"></div>
    <ul>
      <li class='active'><a href='#'>HOME</a></li>
      <li><a href='#'>ABOUT</a></li>
      <li><a href='#'>PRODUCTS</a>
        <ul>
          <li><a href='#'>Product 1</a>
            <ul>
              <li><a href='#'>Sub Product</a></li>
              <li><a href='#'>Sub Product</a></li>
            </ul>
          </li>
          <li><a href='#'>Product 2</a>
            <ul>
              <li><a href='#'>Sub Product</a></li>
              <li><a href='#'>Sub Product</a></li>
            </ul>
          </li>
        </ul>
      </li>
      <li><a href='#'>BIO</a></li>
      <li><a href='#'>VIDEO</a></li>
      <li><a href='#'>GALLERY</a></li>
      <li><a href='#'>CONTACT</a></li>
    </ul>
  </nav>
</header>
<script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>

CSS

* {
  margin: 0;
  padding: 0;
  text-decoration: none
}


header {
  position: relative;
  width: 100%;
  background: #333;
}

.logo {
  position: relative;
  z-index: 123;
  padding: 10px;
  font: 18px verdana;
  color: #6DDB07;
  float: left;
  width: 15%
}

.logo a {
  color: #6DDB07;
}

nav {
  position: relative;
  width: 980px;
  margin: 0 auto;
}

#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a,
#cssmenu #head-mobile {
  border: 0;
  list-style: none;
  line-height: 1;
  display: block;
  position: relative;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box
}

#cssmenu:after,
#cssmenu > ul:after {
  content: ".";
  display: block;
  clear: both;
  visibility: hidden;
  line-height: 0;
  height: 0
}

#cssmenu #head-mobile {
  display: none
}

#cssmenu {
  font-family: sans-serif;
  background: #333
}

#cssmenu > ul > li {
  float: left
}

#cssmenu > ul > li > a {
  padding: 17px;
  font-size: 12px;
  letter-spacing: 1px;
  text-decoration: none;
  color: #ddd;
  font-weight: 700;
}

#cssmenu > ul > li:hover > a,
#cssmenu ul li.active a {
  color: #fff
}

#cssmenu > ul > li:hover,
#cssmenu ul li.active:hover,
#cssmenu ul li.active,
#cssmenu ul li.has-sub.active:hover {
  background: #448D00!important;
  -webkit-transition: background .3s ease;
  -ms-transition: background .3s ease;
  transition: background .3s ease;
}

#cssmenu > ul > li.has-sub > a {
  padding-right: 30px
}

#cssmenu > ul > li.has-sub > a:after {
  position: absolute;
  top: 22px;
  right: 11px;
  width: 8px;
  height: 2px;
  display: block;
  background: #ddd;
  content: ''
}

#cssmenu > ul > li.has-sub > a:before {
  position: absolute;
  top: 19px;
  right: 14px;
  display: block;
  width: 2px;
  height: 8px;
  background: #ddd;
  content: '';
  -webkit-transition: all .25s ease;
  -ms-transition: all .25s ease;
  transition: all .25s ease
}

#cssmenu > ul > li.has-sub:hover > a:before {
  top: 23px;
  height: 0
}

#cssmenu ul ul {
 ...

JavaScript

(function($) {
  $.fn.menumaker = function(options) {
    var cssmenu = $(this),
      settings = $.extend({
        format: "dropdown",
        sticky: false
      }, options);
    return this.each(function() {
      $(this).find(".button").on('click', function() {
        $(this).toggleClass('menu-opened');
        var mainmenu = $(this).next('ul');
        if (mainmenu.hasClass('open')) {
          mainmenu.slideToggle().removeClass('open');
        } else {
          mainmenu.slideToggle().addClass('open');
          if (settings.format === "dropdown") {
            mainmenu.find('ul').show();
          }
        }
      });
      cssmenu.find('li ul').parent().addClass('has-sub');
      multiTg = function() {
        cssmenu.find(".has-sub").prepend('<span class="submenu-button"></span>');
        cssmenu.find('.submenu-button').on('click', function() {
          $(this).toggleClass('submenu-opened');
          if ($(this).siblings('ul').hasClass('open')) {
            $(this).siblings('ul').removeClass('open').slideToggle();
          } else {
            $(this).siblings('ul').addClass('open').slideToggle();
          }
        });
      };
      if (settings.format === 'multitoggle') multiTg();
      else cssmenu.addClass('dropdown');
      if (settings.sticky === true) cssmenu.css('position', 'fixed');
      resizeFix = function() {
        var mediasize = 700;
        if ($(window).width() > mediasize) {
          cssmenu.find('ul').show();
        }
        if ($(window).width() <= mediasize) {
          cssmenu.find('ul').hide().removeClass('open');
        }
      };
      resizeFix();
      return $(window).on('resize', resizeFix);
    });
  };
})(jQuery);

(function($) {
  $(document).ready(function() {
    $("#cssmenu").menumaker({
      format: "multitoggle"
    });
  });
})(jQuery);