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HTML

              
                <nav id='flexmenu'>
    <div class="logo">
      <a href=""><h1>style</h1></a>
    </div>

    <div id="mobile-toggle" class="button"></div>
    <ul id="main-menu">
      <li class='active'><a href='#'>Home</a></li>
      <li><a href='#'>Sale</a></li>
      <li><a href='#'>Shop</a>
         <ul class="sub-menu">
            <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='#'>Lookbook</a></li>
      <li><a href='#'>Locations</a></li>
      <li><a href='#'>Account</a></li>
    </ul>
  </nav>


  <section id="main">
     <div class="note">
      <h2>Responsive Menu Demo</h2>
      <p>  resize window  or</p>
       <p><a href="http://material.io/resizer/#url=http%3A%2F%2Fcodepen.io%2Fvailjoy%2Flive%2FRKxZxW" target="_blank">< view resizer ></a></p>
    </div>
  </section>

              
            
!

CSS

              
                *{
  margin:0;
  padding:0;
  text-decoration:none
}
html{
    height: 100%;
    width: 100%;
    overflow: hidden;
}
body {
    background: linear-gradient(#24222d, #070df9);
    font-family: 'lato', sans-serif;
}
nav {
    background: #2e1f62;
    position: relative;
    margin: 0 auto;
}

#flexmenu{
  display: flex;
  flex-flow: row wrap;
}
.logo {
    z-index: 123;
    padding: 10px;
    font: 18px 'yellowtail';
    color: #FFF;
    flex-grow: 1;
    flex-shrink: 1;
}
.logo a {
    color: #F14F80;
}

#main-menu{
  align-self: flex-end; 
}
/* keep the drop-downs from being hidden by content wrappers etc */
.sub-menu {
  z-index: 1234;
}

/* General Menu Styling */
#flexmenu li,
#flexmenu li a{
    border: 0;
    list-style: none;
    line-height: 1;
    display: inline-block;
    position: relative;
    text-transform: uppercase;
    transition: all ease-in-out .3s;
}

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

#flexmenu ul li.has-sub > a {
    padding-right: 30px;
}
/* Drop icon */
#flexmenu ul li.has-sub > a:after {
    position: absolute;
    top: 22px;
    right: 11px;
    width: 8px;
    height: 2px;
    display: block;
    background: #F14F80;
    content: '';
}
#flexmenu ul ul li.has-sub > a:after {
    position: absolute;
    top: 16px;
    right: 11px;
    width: 8px;
    height: 2px;
    display: block;
    background: #FFF;
    content: '';
}
#flexmenu > ul > li.has-sub > a:before {
    position: absolute;
    top: 19px;
    right: 14px;
    display: block;
    width: 2px;
    height: 8px;
    background: #ddd;
    transition: all .25s ease;
}
#flexmenu > ul > li.has-sub:hover > a:before {
    top: 23px;
    height: 0;
}
#flexmenu ul ul li.has-sub > a:before {
    position: absolute;
    top: 13px;
    right: 14px;
    display: block;
    width: 2px;
    height: 8px;
    background: #FFF;
    content: '';
    transition: all .3s ease;
}
#flexmenu ul ul > li.has-sub:hover > a:before {
    top: 17px;
    height: 0;
}
#flexmenu ul ul li.has-sub:hover,
#flexmenu ul li.has-sub ul li.has-sub ul li:hover {
    background: #751CEC;
}
/* Submenu default states, removed by hover gives the animation */
#flexmenu ul ul {
    position: absolute;
    left: -9999px;
}
#flexmenu li:hover > ul {
    left: auto;
}
#flexmenu ul ul li {
    height: 0;
    background: #F14F80;
    transition: all .25s ease
}
#flexmenu li:hover > ul > li {
    height: 35px;
}
/* tertiary menu */
#flexmenu ul ul ul {
    margin-left: 100%;
    top: 0;
}
#flexmenu ul ul li a {
    padding: 11px 15px;
    width: 170px;
    font-size: 12px;
    text-decoration: none;
    color: #FFF;
    font-weight: 400;
}


/* Content */
#main{
  color: #FFF;
  height: 100vh;
  width: 100vw;
  background: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/927610/e-aupyxbjm-alice-moore.jpg) top center no-repeat;
  background-size: cover;
  position: relative;
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.note {
  width: 80vw;
  max-width: 320px;
  max-height: 200px;
  text-align: center;
  background: #F14F80;
  font-size: 1vw;
  padding: 10px;
  background-clip: padding-box;
}
.note h2 {
  font-weight: 300;
  font-size: 1.5em;
  margin: 10px 0 0;
}
.note p{
  margin: 5px;
}


@media screen and (max-width: 768px) {
  /* Center the logo and remove the bar */
    .logo {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 46px;
        text-align: center;
        padding: 10px 0 0 0;
    }
  
  /* Hamburger */
    .button {
        background: #751CEC;
        width: 60px;
        height: 48px;
        position: absolute;
        right: 0;
        top: 0;
        cursor: pointer;
        z-index: 10000;
    }
    .button:after {
        position: absolute;
        top: 22px;
        right: 20px;
        display: block;
        height: 4px;
        width: 20px;
        border-top: 2px solid #dddddd;
        border-bottom: 2px solid #dddddd;
        content: '';
    }
    .button:before {
        transition: all .3s ease;
        position: absolute;
        top: 16px;
        right: 20px;
        display: block;
        height: 2px;
        width: 20px;
        background: #ddd;
        content: '';
    }
  /* Turn it into an X when open */
    .button.menu-opened{
      background: #2e1f62;
    }
    .button.menu-opened:after {
        transition: all .3s ease;    
        top: 23px;
        border: 0;
        height: 2px;
        width: 19px;
        background: #fff;
        transform: rotate(45deg);
    }
    .button.menu-opened:before {
        top: 23px;
        background: #fff;
        width: 19px;
        transform: rotate(-45deg);
    }
  /* reset horizontal styles */
    #flexmenu ul {
        display: none;
    }
    #flexmenu ul li,
    #flexmenu ul li a,
    #flexmenu ul ul li a{
        width: 100%;
    }

    #flexmenu ul ul li,
    #flexmenu li:hover > ul > li {
        height: auto;  
    }
    #flexmenu ul ul li a {
        padding-left: 25px;
    }
    #flexmenu ul ul ul li a {
        padding-left: 35px;
    }

    #flexmenu ul ul,
    #flexmenu ul ul ul {
        position: relative;
        left: 0;
        width: 100%;
        margin: 0;
        text-align: left;
    }
    #flexmenu ul ul ul li.active a {
        border-left: none;
    }
    #flexmenu > ul > li.has-sub > ul > li.focus > a,
    #flexmenu > ul ul > li.has-sub > ul > li.focus > a {
        background: #262626;
        transition: all .3s ease;
    }
  /* remove cross when menu item is toggled */
    #flexmenu > ul > li.has-sub > a:after,
    #flexmenu > ul > li.has-sub > a:before,
    #flexmenu ul ul > li.has-sub > a:after,
    #flexmenu ul ul > li.has-sub > a:before {
        display: none;
    }

  /* submenu toggles */
    #flexmenu .submenu-button {
        position: absolute;
        z-index: 99;
        right: 0;
        top: 0;
        display: block;
        border-left: 1px solid #444;
        height: 46px;
        width: 46px;
        cursor: pointer;
    }
    #flexmenu ul ul .submenu-button {
        height: 34px;
        width: 34px;
    }
    #flexmenu .submenu-button:after {
        position: absolute;
        top: 22px;
        right: 19px;
        width: 8px;
        height: 2px;
        display: block;
        background: #ddd;
        content: '';
    }
    #flexmenu ul ul .submenu-button:after {
        top: 15px;
        right: 13px;
    }
    #flexmenu .submenu-button.submenu-opened:after {
        background: #fff;
    }
    #flexmenu .submenu-button:before {
        position: absolute;
        top: 19px;
        right: 22px;
        display: block;
        width: 2px;
        height: 8px;
        background: #ddd;
        content: ''
    }
    #flexmenu ul ul .submenu-button:before {
        top: 12px;
        right: 16px;
    }
    #flexmenu .submenu-button.submenu-opened:before {
        display: none;
    }   
  
  .note{
    font-size: 3vw;
  }
}

              
            
!

JS

              
                // See original by emre here https://codepen.io/emredenx/pen/ojcxl
$(document).ready(function ($) {
    $.fn.menumaker = function (options) {
        var flexmenu = $(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();
                    }
                }
            });
            flexmenu.find('li ul').parent().addClass('has-sub');
            subToggle = function () {
                flexmenu.find('.has-sub').prepend('<span class="submenu-button"></span>');
                flexmenu.find('.submenu-button').on('click', function () {
                    $(this).toggleClass('submenu-opened');
                    if ($(this).siblings('ul').hasClass('open')) {
                        $(this).siblings('ul').removeClass('open').slideToggle();
                    } else {
                        $(this).siblings('ul').addClass('open').slideToggle();
                    }
                });
            };
            if (settings.format === 'multitoggle')
                subToggle();
            else
                flexmenu.addClass('dropdown');
            if (settings.sticky === true)
                flexmenu.css('position', 'fixed');
            resizeFix = function () {
                var mediasize = 768;
                if ($(window).width() > mediasize) {
                    flexmenu.find('ul').show();
                }
                if ($(window).width() <= mediasize) {
                    flexmenu.find('ul').hide().removeClass('open');
                }
            };
            resizeFix();
            return $(window).on('resize', resizeFix);
        });
    };

   $('#flexmenu').menumaker({ format: 'multitoggle' });
  
}(jQuery));
              
            
!
999px

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