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Bootstrap 4 Transparent Sticky NavBar

 $(document).ready(function() {
            $(".menu-icon").on("click", function() {
                  $("nav ul").toggleClass("showing");
            });
      });

      // Scrolling Effect

      $(window).on("scroll", function() {
            if($(window).scrollTop()) {
                  $('nav').addClass('black');
            }

            else {
                  $('nav').removeClass('black');
            }
      })
 <div class="wrapper">
         <header>
            <nav>
               <div class="menu-icon">
                  <i class="fa fa-bars fa-2x"></i>
               </div>
               <div class="logo">
                  LOGO
               </div>
               <div class="menu">
                  <ul>
                     <li><a href="#">Home</a></li>
                     <li><a href="#">About</a></li>
                     <li><a href="#">Blog</a></li>
                     <li><a href="#">Contact</a></li>
                     <li><a href="#">Contact</a></li>
                     <li><a href="#">Contact</a></li>
                  </ul>
               </div>
            </nav>
         </header>
         <div class="content">
            <p>
               Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
            </p>
            <p>
               Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
            </p>
         </div>
      </div>
html, body {
      margin: 0;
      padding: 0;
      width: 100%;
}

body {
      font-family: "Helvetica Neue",sans-serif;
      font-weight: lighter;
}

header {
      width: 100%;
      height: 100vh;
      background: url(https://wallpaper.wiki/wp-content/uploads/2017/05/wallpaper.wiki-Beautiful-Full-HD-Wallpaper-Download-Free-PIC-WPE0010098.jpg) no-repeat 50% 50%;
      background-size: cover;
}

.content {
      width: 94%;
      margin: 4em auto;
      font-size: 20px;
      line-height: 30px;
      text-align: justify;
}

.logo {
      line-height: 60px;
      position: fixed;
      float: left;
      margin: 16px 46px;
      color: #fff;
      font-weight: bold;
      font-size: 20px;
      letter-spacing: 2px;
}

nav {
      position: fixed;
      width: 100%;
      line-height: 60px;
}

nav ul {
      line-height: 60px;
      list-style: none;
      background: rgba(0, 0, 0, 0);
      overflow: hidden;
      color: #fff;
      padding: 0;
      text-align: right;
      margin: 0;
      padding-right: 40px;
      transition: 1s;
}

nav.black ul {
      background: #000;
}

nav ul li {
      display: inline-block;
      padding: 16px 40px;;
}

nav ul li a {
      text-decoration: none;
      color: #fff;
      font-size: 16px;
}

.menu-icon {
      line-height: 60px;
      width: 100%;
      background: #000;
      text-align: right;
      box-sizing: border-box;
      padding: 15px 24px;
      cursor: pointer;
      color: #fff;
      display: none;
}

@media(max-width: 786px) {

      .logo {
            position: fixed;
            top: 0;
            margin-top: 16px;
      }

      nav ul {
            max-height: 0px;
            background: #000;
      }

      nav.black ul {
            background: #000;
      }

      .showing {
            max-height: 34em;
      }

      nav ul li {
            box-sizing: border-box;
            width: 100%;
            padding: 24px;
            text-align: center;
      }

      .menu-icon {
            display: block;
      }

}
RUN
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