"Responsive CSS3 Menu Dropdown + Submenus Width Toggle Animation"
Bootstrap 4.1.1 Snippet by Manish Yadav

<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <header> <nav id='cssmenu'> <div class="logo"><a href="index.html">Responsive </a></div> <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> <section style='padding-top:20px;font:bold 44px arial;color:#68D800;'> Responsive CSS3 Menu <br />Dropdown + Submenus <br /> Width Toggle Animation </section>
*{margin:0;padding:0;text-decoration:none} body{background:#555;} 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{position:absolute;left:-9999px} #cssmenu ul ul li{height:0;-webkit-transition:all .25s ease;-ms-transition:all .25s ease;background:#333;transition:all .25s ease} #cssmenu ul ul li:hover{} #cssmenu li:hover > ul{left:auto} #cssmenu li:hover > ul > li{height:35px} #cssmenu ul ul ul{margin-left:100%;top:0} #cssmenu ul ul li a{border-bottom:1px solid rgba(150,150,150,0.15);padding:11px 15px;width:170px;font-size:12px;text-decoration:none;color:#ddd;font-weight:400;} #cssmenu ul ul li:last-child > a,#cssmenu ul ul li.last-item > a{border-bottom:0} #cssmenu ul ul li:hover > a,#cssmenu ul ul li a:hover{color:#fff} #cssmenu ul ul li.has-sub > a:after{position:absolute;top:16px;right:11px;width:8px;height:2px;display:block;background:#ddd;content:''} #cssmenu ul ul li.has-sub > a:before{position:absolute;top:13px;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 ul > li.has-sub:hover > a:before{top:17px;height:0} #cssmenu ul ul li.has-sub:hover,#cssmenu ul li.has-sub ul li.has-sub ul li:hover{background:#363636;} #cssmenu ul ul ul li.active a{border-left:1px solid #333} #cssmenu > ul > li.has-sub > ul > li.active > a,#cssmenu > ul ul > li.has-sub > ul > li.active> a{border-top:1px solid #333} @media screen and (max-width:1000px){ .logo{position:absolute;top:0;left: 0;width:100%;height:46px;text-align:center;padding:10px 0 0 0 ;float:none} .logo2{display:none} nav{width:100%;} #cssmenu{width:100%} #cssmenu ul{width:100%;display:none} #cssmenu ul li{width:100%;border-top:1px solid #444} #cssmenu ul li:hover{background:#363636;} #cssmenu ul ul li,#cssmenu li:hover > ul > li{height:auto} #cssmenu ul li a,#cssmenu ul ul li a{width:100%;border-bottom:0} #cssmenu > ul > li{float:none} #cssmenu ul ul li a{padding-left:25px} #cssmenu ul ul li{background:#333!important;} #cssmenu ul ul li:hover{background:#363636!important} #cssmenu ul ul ul li a{padding-left:35px} #cssmenu ul ul li a{color:#ddd;background:none} #cssmenu ul ul li:hover > a,#cssmenu ul ul li.active > a{color:#fff} #cssmenu ul ul,#cssmenu ul ul ul{position:relative;left:0;width:100%;margin:0;text-align:left} #cssmenu > ul > li.has-sub > a:after,#cssmenu > ul > li.has-sub > a:before,#cssmenu ul ul > li.has-sub > a:after,#cssmenu ul ul > li.has-sub > a:before{display:none} #cssmenu #head-mobile{display:block;padding:23px;color:#ddd;font-size:12px;font-weight:700} .button{width:55px;height:46px;position:absolute;right:0;top:0;cursor:pointer;z-index: 12399994;} .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{-webkit-transition:all .3s ease;-ms-transition:all .3s ease;transition:all .3s ease;position:absolute;top:16px;right:20px;display:block;height:2px;width:20px;background:#ddd;content:''} .button.menu-opened:after{-webkit-transition:all .3s ease;-ms-transition:all .3s ease;transition:all .3s ease;top:23px;border:0;height:2px;width:19px;background:#fff;-webkit-transform:rotate(45deg);-moz-transform:rotate(45deg);-ms-transform:rotate(45deg);-o-transform:rotate(45deg);transform:rotate(45deg)} .button.menu-opened:before{top:23px;background:#fff;width:19px;-webkit-transform:rotate(-45deg);-moz-transform:rotate(-45deg);-ms-transform:rotate(-45deg);-o-transform:rotate(-45deg);transform:rotate(-45deg)} #cssmenu .submenu-button{position:absolute;z-index:99;right:0;top:0;display:block;border-left:1px solid #444;height:46px;width:46px;cursor:pointer} #cssmenu .submenu-button.submenu-opened{background:#262626} #cssmenu ul ul .submenu-button{height:34px;width:34px} #cssmenu .submenu-button:after{position:absolute;top:22px;right:19px;width:8px;height:2px;display:block;background:#ddd;content:''} #cssmenu ul ul .submenu-button:after{top:15px;right:13px} #cssmenu .submenu-button.submenu-opened:after{background:#fff} #cssmenu .submenu-button:before{position:absolute;top:19px;right:22px;display:block;width:2px;height:8px;background:#ddd;content:''} #cssmenu ul ul .submenu-button:before{top:12px;right:16px} #cssmenu .submenu-button.submenu-opened:before{display:none} #cssmenu ul ul ul li.active a{border-left:none} #cssmenu > ul > li.has-sub > ul > li.active > a,#cssmenu > ul ul > li.has-sub > ul > li.active > a{border-top:none} }
(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 { $(this).siblings('ul').addClass('open').slideToggle(); } }); }; if (settings.format === 'multitoggle') multiTg(); else cssmenu.addClass('dropdown'); if (settings.sticky === true) cssmenu.css('position', 'fixed'); resizeFix = function() { var mediasize = 1000; if ($( 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);

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