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CSS

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="main">
<header class="header">
  <div class="hero">
    <div class="container">
      <h1>Let's Build: With JavaScript - Sticky Nav</h1>
    </div>
  </div>
  <nav class="primary-nav">
    <ul class="nav">
      <li><a href="#"><svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg" width="24" height="24"><title>sun</title><path d="M24 7.029L19 5l-2-5-5 2-5-2-2 5-5 2.029L2 12l-2 4.971L5 19l2 5 5-2 5 2 2-5 5-2.029L22 12zM12 18a6 6 0 1 1 0-12 6 6 0 0 1 0 12z"/></svg></a></li>
      <li><a href="#">Home</a></li>
      <li><a href="#">About</a></li>
      <li><a href="#">Links</a></li>
      <li><a href="#">Blog</a></li>
      <li><a href="#">Contact</a></li>
      <li class="hire-me"><a href="#">Hire me!</a></li>
    </ul>
  </nav> 
</header>

<div class="content">
  <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Debitis, amet adipisci! Mollitia porro, esse fuga eos rem enim vel dolorem, numquam, necessitatibus nobis animi quis? Voluptatem, ipsum quos. Libero, maxime.</p>
  <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Qui non quibusdam sint nihil excepturi rerum maiores iusto dolorem id neque itaque vero, deleniti, vel possimus? Quidem asperiores fugit veritatis assumenda?</p>
<p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Nostrum ducimus fuga numquam modi, voluptas mollitia sit consectetur est aperiam a eaque. Ex fugit vero unde repellat officiis quae rerum cumque.>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Nostrum ducimus fuga numquam modi, voluptas mollitia sit consectetur est aperiam a eaque. Ex fugit vero unde repellat officiis quae rerum cumque.</p>
    
<p>Nulla vitae elit libero, a pharetra augue. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Maecenas faucibus mollis interdum. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum.</p>

<p>Maecenas faucibus mollis interdum. Nullam id dolor id nibh ultricies vehicula ut id elit. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Nullam id dolor id nibh ultricies vehicula ut id elit. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Maecenas faucibus mollis interdum. Aenean lacinia bibendum nulla sed consectetur.</p>

<p>Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Aenean lacinia bibendum nulla sed consectetur. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>

<p>Sed posuere consectetur est at lobortis. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Integer posuere erat a ante venenatis dapibus posuere velit aliquet. Sed posuere consectetur est at lobortis. Etiam porta sem malesuada magna mollis euismod. Donec id elit non mi porta gravida at eget metus.</p>
  
<p>Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Aenean lacinia bibendum nulla sed consectetur. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>

<p>Sed posuere consectetur est at lobortis. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Morbi leo risus, porta ac consectetur ac, vestibulum at eros. Integer posuere erat a ante venenatis dapibus posuere velit aliquet. Sed posuere consectetur est at lobortis. Etiam porta sem malesuada magna mollis euismod. Donec id elit non mi porta gravida at eget metus.</p>
</div>
</div>
!

CSS 

              
                .container {
  max-width: 1200px;
  margin: 0 auto;
}

.hero {
  background-image: url(https://images.unsplash.com/photo-1479621051492-5a6f9bd9e51a?ixlib=rb-0.3.5&q=85&fm=jpg&crop=entropy&cs=srgb&ixid=eyJhcHBfaWQiOjE0NTg5fQ&s=282eb7b3a40113da0e089027d036a796);
  background-size: cover;
  background-position: bottom center;
  background-repeat: no-repeat;
  background-color: #222;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  color: white;
  min-height: 450px;
  
  h1 {
    text-shadow: 0 0 1px rgba(black, .1);
  }
  
}


nav {
  background: #242424;
  padding: 20px 0;
  position: relative;
}

.nav {
  display: flex;
  align-items: center;
  list-style: none;
  justify-content: space-between;
  max-width: 800px;
  margin: 0 auto;
  padding: 0;

  
  @media screen and (max-width: 767px) {
    flex-direction: column;
    li {
      padding: 10px 0;
    }
  }
  
  a {
    color: white;
    text-decoration: none;
    
    svg { fill: white; }
  }
  
  .hire-me { 
    position: absolute;
    right: 20px;
    display: none;
      -webkit-animation: fadein 1s;
       -moz-animation: fadein 1s;
     animation: fadein 1s;
    
    a {
      background: rgb(131,58,180);
background: linear-gradient(90deg, rgba(131,58,180,1) 0%, rgba(252,72,69,1) 100%);
      padding: 10px 16px;
      border-radius: 3px;
      transition: all .3s ease;
      
      &:hover {
        filter: brightness(120%);
      }
     
    }
  }
}

.content {
  max-width: 800px;
  padding: 20px;
  margin: 0 auto;
  line-height: 1.5;
}

// You could add CSS to offset the fixed position or in our JS we use an exact amount thanks to offsetHeight
// .fixed .content {
//   padding-top: 68px;
// }

.fixed .primary-nav {
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  box-shadow: 0 3px 6px rgba(black, .3);
}

@keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@-moz-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Safari, Chrome and Opera > 12.1 */
@-webkit-keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}
!

JS 

              
                /* Let's Build: With JavaScript - Web-Crunch.com
   Subscribe on YouTube - https://youtube.com/c/webcrunch
   
   Let's Build: Sticky Nav 
*/

const nav = document.querySelector('.primary-nav');
const topToNav = nav.offsetTop;
const main = document.querySelector('.main');

function stickyNav() {
  if (window.scrollY >= topToNav) {
      main.style.paddingTop = nav.offsetHeight + 'px';
      main.classList.add('fixed');
      document.querySelector('.hire-me').style.display = "block";
  } else {
      main.style.paddingTop = 0;
      main.classList.remove('fixed');
      document.querySelector('.hire-me').style.display = "none";
  }
}


window.addEventListener('scroll', stickyNav);
!
999px

Console