CodePen Embed - Responsive Bootstrap 4 menu

<body class="hero-anime"> 

  <div class="navigation-wrap bg-light start-header start-style">
    <div class="container">
      <div class="row">
        <div class="col-12">
          <nav class="navbar navbar-expand-md navbar-light">
          
            <a class="navbar-brand" href="https://front.codes/" target="_blank"><img src="https://assets.codepen.io/1462889/fcy.png" alt=""></a>  
            
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
              <span class="navbar-toggler-icon"></span>
            </button>
            
            <div class="collapse navbar-collapse" id="navbarSupportedContent">
              <ul class="navbar-nav ml-auto py-4 py-md-0">
                <li class="nav-item pl-4 pl-md-0 ml-0 ml-md-4 active">
                  <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Home</a>
                  <div class="dropdown-menu">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <a class="dropdown-item" href="#">Something else here</a>
                    <a class="dropdown-item" href="#">Another action</a>
                  </div>
                </li>
                <li class="nav-item pl-4 pl-md-0 ml-0 ml-md-4">
                  <a class="nav-link" href="#">Portfolio</a>
                </li>
                <li class="nav-item pl-4 pl-md-0 ml-0 ml-md-4">
                  <a class="nav-link" href="#">Agency</a>
                </li>
                <li class="nav-item pl-4 pl-md-0 ml-0 ml-md-4">
                  <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Services</a>
                  <div class="dropdown-menu">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <a class="dropdown-item" href="#">Something else here</a>
                    <a class="dropdown-item" href="#">Another action</a>
                  </div>
                </li>
                <li class="nav-item pl-4 pl-md-0 ml-0 ml-md-4">
                  <a class="nav-link" href="#">Journal</a>
                </li>
                <li class="nav-item pl-4 pl-md-0 ml-0 ml-md-4">
                  <a class="nav-link" href="#">Contact</a>
                </li>
              </ul>
            </div>
            
          </nav>    
        </div>
      </div>
    </div>
  </div>
  <div class="section full-height">
    <div class="absolute-center">
      <div class="section">
        <div class="container">
          <div class="row">
            <div class="col-12">
        <h1><span>B</span><span>o</span><span>o</span><span>t</span><span>s</span><span>t</span><span>r</span><span>a</span><span>p</span> <span>4</span><br>
        <span>m</span><span>e</span><span>n</span><span>u</span></h1>
        <p>scroll for nav animation</p> 
            </div>  
          </div>    
        </div>    
      </div>
      <div class="section mt-5">
        <div class="container">
          <div class="row">
            <div class="col-12">
              <div id="switch">
                <div id="circle"></div>
              </div>
            </div>  
          </div>    
        </div>      
      </div>
    </div>
  </div>
  <div class="my-5 py-5">
  </div>
  
<!-- Link to page
================================================== -->

  <a href="https://front.codes/" class="logo" target="_blank">
    <img src="https://assets.codepen.io/1462889/fcy.png" alt="">
  </a>

</body>



/* Please ❤ this if you like it! */


@import url('https://fonts.googleapis.com/css?family=Poppins:100,100i,200,200i,300,300i,400,400i,500,500i,600,600i,700,700i,800,800i,900,900i&subset=devanagari,latin-ext');

/* #Primary
================================================== */

body{
    font-family: 'Poppins', sans-serif;
  font-size: 16px;
  line-height: 24px;
  font-weight: 400;
  color: #212112;
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/1462889/pat-back.svg');
  background-position: center;
  background-repeat: repeat;
  background-size: 7%;
  background-color: #fff;
  overflow-x: hidden;
    transition: all 200ms linear;
}
::selection {
  color: #fff;
  background-color: #8167a9;
}
::-moz-selection {
  color: #fff;
  background-color: #8167a9;
}


/* #Navigation
================================================== */

.start-header {
  opacity: 1;
  transform: translateY(0);
  padding: 20px 0;
  box-shadow: 0 10px 30px 0 rgba(138, 155, 165, 0.15);
  -webkit-transition : all 0.3s ease-out;
  transition : all 0.3s ease-out;
}
.start-header.scroll-on {
  box-shadow: 0 5px 10px 0 rgba(138, 155, 165, 0.15);
  padding: 10px 0;
  -webkit-transition : all 0.3s ease-out;
  transition : all 0.3s ease-out;
}
.start-header.scroll-on .navbar-brand img{
  height: 24px;
  -webkit-transition : all 0.3s ease-out;
  transition : all 0.3s ease-out;
}
.navigation-wrap{
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  z-index: 1000;
  -webkit-transition : all 0.3s ease-out;
  transition : all 0.3s ease-out;
}
.navbar{
  padding: 0;
}
.navbar-brand img{
  height: 28px;
  width: auto;
  display: block;
  filter: brightness(10%);
  -webkit-transition : all 0.3s ease-out;
  transition : all 0.3s ease-out;
}
.navbar-toggler {
  float: right;
  border: none;
  padding-right: 0;
}
.navbar-toggler:active,
.navbar-toggler:focus {
  outline: none;
}
.navbar-light .navbar-toggler-icon {
  width: 24px;
  height: 17px;
  background-image: none;
  position: relative;
  border-bottom: 1px solid #000;
    transition: all 300ms linear;
}
.navbar-light .navbar-toggler-icon:after, 
.navbar-light .navbar-toggler-icon:before{
  width: 24px;
  position: absolute;
  height: 1px;
  background-color: #000;
  top: 0;
  left: 0;
  content: '';
  z-index: 2;
    transition: all 300ms linear;
}
.navbar-light .navbar-toggler-icon:after{
  top: 8px;
}
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon:after {
  transform: rotate(45deg);
}
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon:before {
  transform: translateY(8px) rotate(-45deg);
}
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon {
  border-color: transparent;
}
.nav-link{
  color: #212121 !important;
  font-weight: 500;
    transition: all 200ms linear;
}
.nav-item:hover .nav-link{
  color: #8167a9 !important;
}
.nav-item.active .nav-link{
  color: #777 !important;
}
.nav-link {
  position: relative;
  padding: 5px 0 !important;
  display: inline-block;
}
.nav-item:after{
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  content: '';
  background-color: #8167a9;
  opacity: 0;
    transition: all 200ms linear;
}
.nav-item:hover:after{
  bottom: 0;
  opacity: 1;
}
.nav-item.active:hover:after{
  opacity: 0;
}
.nav-item{
  position: relative;
    transition: all 200ms linear;
}

/* #Primary style
================================================== */

.bg-light {
  background-color: #fff !important;
    transition: all 200ms linear;
}
.section {
    position: relative;
  width: 100%;
  display: block;
}
.full-height {
    height: 100vh;
}
.over-hide {
    overflow: hidden;
}
.absolute-center {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  margin-top: 40px;
  transform: translateY(-50%);
  z-index: 20;
}
h1{
  font-size: 48px;
  line-height: 1.2;
  font-weight: 700;
  color: #212112;
  text-align: center;
}
p{
  text-align: center;
  margin: 0;
  padding-top: 10px;
  opacity: 1;
  transform: translate(0);
    transition: all 300ms linear;
    transition-delay: 1700ms;
}
body.hero-anime p{
  opacity: 0;
  transform: translateY(40px);
    transition-delay: 1700ms;
}
h1 span{
  display: inline-block;
    transition: all 300ms linear;
  opacity: 1;
  transform: translate(0);
}
body.hero-anime h1 span:nth-child(1){
  opacity: 0;
  transform: translateY(-20px);
}
body.hero-anime h1 span:nth-child(2){
  opacity: 0;
  transform: translateY(-30px);
}
body.hero-anime h1 span:nth-child(3){
  opacity: 0;
  transform: translateY(-50px);
}
body.hero-anime h1 span:nth-child(4){
  opacity: 0;
  transform: translateY(-10px);
}
body.hero-anime h1 span:nth-child(5){
  opacity: 0;
  transform: translateY(-50px);
}
body.hero-anime h1 span:nth-child(6){
  opacity: 0;
  transform: translateY(-20px);
}
body.hero-anime h1 span:nth-child(7){
  opacity: 0;
  transform: translateY(-40px);
}
body.hero-anime h1 span:nth-child(8){
  opacity: 0;
  transform: translateY(-10px);
}
body.hero-anime h1 span:nth-child(9){
  opacity: 0;
  transform: translateY(-30px);
}
body.hero-anime h1 span:nth-child(10){
  opacity: 0;
  transform: translateY(-20px);
}
h1 span:nth-child(1){
    transition-delay: 1000ms;
}
h1 span:nth-child(2){
    transition-delay: 700ms;
}
h1 span:nth-child(3){
    transition-delay: 900ms;
}
h1 span:nth-child(4){
    transition-delay: 800ms;
}
h1 span:nth-child(5){
    transition-delay: 1000ms;
}
h1 span:nth-child(6){
    transition-delay: 700ms;
}
h1 span:nth-child(7){
    transition-delay: 900ms;
}
h1 span:nth-child(8){
    transition-delay: 800ms;
}
h1 span:nth-child(9){
    transition-delay: 600ms;
}
h1 span:nth-child(10){
    transition-delay: 700ms;
}
body.hero-anime h1 span:nth-child(11){
  opacity: 0;
  transform: translateY(30px);
}
body.hero-anime h1 span:nth-child(12){
  opacity: 0;
  transform: translateY(50px);
}
body.hero-anime h1 span:nth-child(13){
  opacity: 0;
  transform: translateY(20px);
}
body.hero-anime h1 span:nth-child(14){
  opacity: 0;
  transform: translateY(30px);
}
body.hero-anime h1 span:nth-child(15){
  opacity: 0;
  transform: translateY(50px);
}
h1 span:nth-child(11){
    transition-delay: 1300ms;
}
h1 span:nth-child(12){
    transition-delay: 1500ms;
}
h1 span:nth-child(13){
    transition-delay: 1400ms;
}
h1 span:nth-child(14){
    transition-delay: 1200ms;
}
h1 span:nth-child(15){
    transition-delay: 1450ms;
}
#switch,
#circle {
  cursor: pointer;
  -webkit-transition: all 300ms linear;
  transition: all 300ms linear; 
} 
#switch {
  width: 60px;
  height: 8px;
  border: 2px solid #8167a9;
  border-radius: 27px;
  background: #000;
  position: relative;
  display: block;
  margin: 0 auto;
  text-align: center;
  opacity: 1;
  transform: translate(0);
    transition: all 300ms linear;
    transition-delay: 1900ms;
}
body.hero-anime #switch{
  opacity: 0;
  transform: translateY(40px);
    transition-delay: 1900ms;
}
#circle {
  position: absolute;
  top: -11px;
  left: -13px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #000;
}
.switched {
  border-color: #000 !important;
  background: #8167a9 !important;
}
.switched #circle {
  left: 43px;
  box-shadow: 0 4px 4px rgba(26,53,71,0.25), 0 0 0 1px rgba(26,53,71,0.07);
  background: #fff;
}
.nav-item .dropdown-menu {
    transform: translate3d(0, 10px, 0);
    visibility: hidden;
    opacity: 0;
  max-height: 0;
    display: block;
  padding: 0;
  margin: 0;
    transition: all 200ms linear;
}
.nav-item.show .dropdown-menu {
    opacity: 1;
    visibility: visible;
  max-height: 999px;
    transform: translate3d(0, 0px, 0);
}
.dropdown-menu {
  padding: 10px!important;
  margin: 0;
  font-size: 13px;
  letter-spacing: 1px;
  color: #212121;
  background-color: #fcfaff;
  border: none;
  border-radius: 3px;
  box-shadow: 0 5px 10px 0 rgba(138, 155, 165, 0.15);
    transition: all 200ms linear;
}
.dropdown-toggle::after {
  display: none;
}

.dropdown-item {
  padding: 3px 15px;
  color: #212121;
  border-radius: 2px;
    transition: all 200ms linear;
}
.dropdown-item:hover, 
.dropdown-item:focus {
  color: #fff;
  background-color: rgba(129,103,169,.6);
}

body.dark{
  color: #fff;
  background-color: #1f2029;
}
body.dark .navbar-brand img{
  filter: brightness(100%);
}
body.dark h1{
  color: #fff;
}
body.dark h1 span{
    transition-delay: 0ms !important;
}
body.dark p{
  color: #fff;
    transition-delay: 0ms !important;
}
body.dark .bg-light {
  background-color: #14151a !important;
}
body.dark .start-header {
  box-shadow: 0 10px 30px 0 rgba(0, 0, 0, 0.15);
}
body.dark .start-header.scroll-on {
  box-shadow: 0 5px 10px 0 rgba(0, 0, 0, 0.15);
}
body.dark .nav-link{
  color: #fff !important;
}
body.dark .nav-item.active .nav-link{
  color: #999 !important;
}
body.dark .dropdown-menu {
  color: #fff;
  background-color: #1f2029;
  box-shadow: 0 5px 10px 0 rgba(0, 0, 0, 0.25);
}
body.dark .dropdown-item {
  color: #fff;
}
body.dark .navbar-light .navbar-toggler-icon {
  border-bottom: 1px solid #fff;
}
body.dark .navbar-light .navbar-toggler-icon:after, 
body.dark .navbar-light .navbar-toggler-icon:before{
  background-color: #fff;
}
body.dark .navbar-toggler[aria-expanded="true"] .navbar-toggler-icon {
  border-color: transparent;
}



/* #Media
================================================== */

@media (max-width: 767px) { 
  h1{
    font-size: 38px;
  }
  .nav-item:after{
    display: none;
  }
  .nav-item::before {
    position: absolute;
    display: block;
    top: 15px;
    left: 0;
    width: 11px;
    height: 1px;
    content: "";
    border: none;
    background-color: #000;
    vertical-align: 0;
  }
  .dropdown-toggle::after {
    position: absolute;
    display: block;
    top: 10px;
    left: -23px;
    width: 1px;
    height: 11px;
    content: "";
    border: none;
    background-color: #000;
    vertical-align: 0;
    transition: all 200ms linear;
  }
  .dropdown-toggle[aria-expanded="true"]::after{
    transform: rotate(90deg);
    opacity: 0;
  }
  .dropdown-menu {
    padding: 0 !important;
    background-color: transparent;
    box-shadow: none;
    transition: all 200ms linear;
  }
  .dropdown-toggle[aria-expanded="true"] + .dropdown-menu {
    margin-top: 10px !important;
    margin-bottom: 20px !important;
  }
  body.dark .nav-item::before {
    background-color: #fff;
  }
  body.dark .dropdown-toggle::after {
    background-color: #fff;
  }
  body.dark .dropdown-menu {
    background-color: transparent;
    box-shadow: none;
  }
}

/* #Link to page
================================================== */

.logo {
  position: absolute;
  bottom: 30px;
  right: 30px;
  display: block;
  z-index: 100;
  transition: all 250ms linear;
}
.logo img {
  height: 26px;
  width: auto;
  display: block;
  filter: brightness(10%);
  transition: all 250ms linear;
}
body.dark .logo img {
  filter: brightness(100%);
}



/* Please ❤ this if you like it! */


(function($) { "use strict";

  $(function() {
    var header = $(".start-style");
    $(window).scroll(function() {    
      var scroll = $(window).scrollTop();
    
      if (scroll >= 10) {
        header.removeClass('start-style').addClass("scroll-on");
      } else {
        header.removeClass("scroll-on").addClass('start-style');
      }
    });
  });   
    
  //Animation
  
  $(document).ready(function() {
    $('body.hero-anime').removeClass('hero-anime');
  });

  //Menu On Hover
    
  $('body').on('mouseenter mouseleave','.nav-item',function(e){
      if ($(window).width() > 750) {
        var _d=$(e.target).closest('.nav-item');_d.addClass('show');
        setTimeout(function(){
        _d[_d.is(':hover')?'addClass':'removeClass']('show');
        },1);
      }
  }); 
  
  //Switch light/dark
  
  $("#switch").on('click', function () {
    if ($("body").hasClass("dark")) {
      $("body").removeClass("dark");
      $("#switch").removeClass("switched");
    }
    else {
      $("body").addClass("dark");
      $("#switch").addClass("switched");
    }
  });  
  
  })(jQuery);

This Pen is owned by Ivan Grozdic on CodePen.

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External CSS

https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css

External CSS

External JavaScript