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

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<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;'>
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*{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}
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(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() {
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