"Responsive CSS3 Menu Dropdown + Submenus Width Toggle Animation"
Bootstrap 4.0.0 Snippet by Rajnesh Prajapati

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/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 ---------->
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>CSS3 Responsive Menu Dropdown + Submenu width Logo</title>
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<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>
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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,
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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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