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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="container">
  <header class="header">HEADER</header>
  <div class="content">
    <div class="menu">
      <a>Home</a>
      <a>About</a>
      <a>Portfolio</a>
      <a>Blog</a>
      <a>Contact</a>
    </div>
    <div class="text">
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nemo, qui minus. Voluptate repellendus, modi, voluptates nihil pariatur id quasi, iusto voluptatibus tempora ullam quia reiciendis ratione atque in quae fugiat.</p>
      <p>Sint voluptatum velit debitis fugit! Illum, provident hic! Itaque commodi quae numquam minus unde, fuga fugit, perspiciatis pariatur amet dicta, vero sint saepe. Eaque, dicta dignissimos pariatur ad commodi soluta.</p>
      <p>Voluptas numquam sapiente deserunt velit neque commodi, sunt quas odio repellendus unde laborum adipisci ducimus quo facere ipsa, dignissimos molestiae. Repellendus consequatur vel eaque quia molestiae voluptate excepturi dolore obcaecati!</p>
      <p>Molestias hic consequuntur dolores exercitationem, dignissimos est, explicabo dolorem rem corrupti corporis magni voluptates! Nostrum eaque nisi, nulla similique asperiores id molestias quos, fuga, aut natus adipisci saepe consectetur iusto.</p>
      <p>Ea, atque quibusdam ex vitae ducimus sed vero in cupiditate quasi ipsam non pariatur quaerat dicta autem quos perferendis velit, fugit rem repellat nemo dignissimos iusto quod, deserunt error! Autem?</p>
      <p>Ea blanditiis, soluta quos expedita odio architecto. Doloremque suscipit dolorum debitis libero cumque ea accusamus, animi pariatur quis quidem enim totam iste fugit sed perspiciatis corporis autem quia possimus sit!</p>
      <p>Dicta perferendis sapiente doloribus quo? Sunt, repudiandae repellendus recusandae fuga maxime odit. Accusamus eaque sint hic delectus, dicta animi repudiandae ad illum sapiente quasi. Officia vitae fuga numquam soluta perspiciatis.</p>
      <p>Error, ipsum id! Iste quis doloremque explicabo, laboriosam voluptatum similique magnam corporis ratione, minima consequuntur minus quos aliquid, fugiat vero autem voluptate ab ea. Molestias sint molestiae sed placeat velit.</p>
      <p>Adipisci sapiente eligendi quam consequuntur in expedita iste dicta debitis aliquam quis, non hic deleniti possimus ducimus. Provident mollitia a porro officia pariatur nisi, eligendi officiis, temporibus veniam similique totam.</p>
      <p>Enim accusamus perspiciatis neque possimus libero obcaecati commodi nostrum exercitationem amet non ipsa dolor sed in voluptate et nesciunt ab, impedit, repellendus fugiat. Cupiditate vel molestiae, voluptatibus veritatis magnam veniam!</p>
    </div>
    <div class="text"></div>
  </div>
</div>
!

CSS 

              
                .menu{
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-around;
  background-color: pink;
  padding: 10px 0;
  font-family: 'Roboto Slab', sans-serif;
  text-transform: uppercase;
}
.menu.sticky{
  position: fixed;
}

.header{
  padding: 40px;
  text-align: center;
  background-color: yellow;
  font-family: 'Roboto Slab', sans-serif;
}
.container {
  max-width:90%;
  width: 600px;
  margin: 0 auto;
  position: relative;
  
}
.text{
  min-height: 100vh;
  background-color: #ccc;
  border-bottom: 2px solid green;
  padding: 20px;
}
.text p{
  margin-bottom: 20px;
}
@media screen and (max-width: 480px){
  .menu a{
    font-size: 10px;
  }
}
!

JS 

              
                $(function() {

  (function fixedMenu() {
    var $menu = $(".menu");

    if ($menu.length != 0) {
      var $menuHeight = $menu.outerHeight();
      var $menuMarginBottom = parseFloat( $menu.css("margin-bottom") );
      var $menuOffsetY = $menu.offset().top;
      var $menuParent = $menu.parent();
      var $menuParentPaddingTop = parseFloat( $menuParent.css("padding-top") );

      $(window).scroll(fixMenu);

      $(window).resize(resizeMenu);

      function fixMenu() {
        var $menuWidth = $menu.outerWidth();
        var $menuParentWidth = $menuParent.outerWidth();

        if ($(window).scrollTop() >= $menuOffsetY) {
          $menu.addClass("sticky").css({ "width": $menuParentWidth });
          $menuParent.css({ "padding-top": $menuHeight + $menuMarginBottom + $menuParentPaddingTop });
        } else {
          $menu.removeClass("sticky").css({ "width": $menuWidth });
          $menuParent.css({ "padding-top": $menuParentPaddingTop });
        }
      }

      function resizeMenu() {
        var $menuParentWidth = $menuParent.outerWidth();
        $menu.css({ width: $menuParentWidth });
      }
    }
  })();

});
!
999px

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