Bootstrap Snippet Responsive sticky header navigation by Bootstrap 4.0.0 using HTML CSS Javascript

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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="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<!DOCTYPE html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
    
    <link rel="stylesheet" type="text/css" href="css/style.css">
  </head>
  <body>
    <header>
       <nav class="navbar navbar-expand-lg navbar-light bg-danger text-light py-3 main-nav">
          <div class="container">
            <a class="navbar-brand" href="index.html"><img src="https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwjhjPfY_97WAhWCOI8KHSvHA34QjRwIBw&url=http%3A%2F%2Fpluspng.com%2Fhp-png-1793.html&psig=AOvVaw38ZFiKrvcpgGwQUMhu9Vx8&ust=1507481987906950" alt="Logo"></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">
                  <li class="nav-item active">
                    <a class="nav-link text-uppercase" href="index.html">Home <span class="sr-only">(current)</span></a>
                  </li>
                  <li class="nav-item">
                    <a class="nav-link text-uppercase" href="#story">about</a>
                  </li>
                  <li class="nav-item">
                    <a class="nav-link text-uppercase" href="#expertise">expertise</a>
                  </li>
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header .main-nav{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 4000;
}
header .main-nav-scrolled{
    background-color: rgba(0,0,0,0.4);
}
.navbar-light .navbar-nav .nav-link{
    color: #fff;
}
.navbar-light .navbar-nav .active .nav-link{
    color: #00e0d0;
}
/*for test*/
body{
  height: 400px;
}
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var  mn = $(".main-nav");
    mns = "main-nav-scrolled";
    hdr = $('header').height();
$(window).scroll(function() {
  if( $(this).scrollTop() > hdr ) {
    mn.addClass(mns);
  } else {
    mn.removeClass(mns);
  }
});
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"Responsive sticky header navigation by Bootstrap 4.0.0"
Bootstrap 4.0.0 Snippet by Noman1416

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"Responsive sticky header navigation by Bootstrap 4.0.0" Bootstrap 4.0.0 Snippet by Noman1416

Related: See More

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"Responsive sticky header navigation by Bootstrap 4.0.0"
Bootstrap 4.0.0 Snippet by Noman1416