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About the <head>

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CSS

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HTML 

              
                <!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
    <link rel="stylesheet" href="css/index.css">
    <script src="js/index.js"></script>
    <script src="js/sticky_navbar.js"></script>

<title>Test Seite</title>

</head>

<body>
<div class="navbar-container">
    <div class="navbar" id="myTopnav">
        <a class="active" href="#"><i class="fa fa-fw fa-home"></i> Home</a>
        <a href="#"><i class="fa fa-fw fa-user"></i> About</a>
        <a href="#"><i class="fa fa-fw fa-envelope"></i> Contact</a>
        <a href="javascript:void(0);" class="icon" onclick="myFunction()">
        <i class="fa fa-bars"></i>
        </a>
    </div>
</div>
    <div class="bgimg-1">
        <div class="caption">
            <span class="border-img"><img src="images/logo.png"></span>
        </div>
    </div>

    <div class="style-bgimg-1">
        <h3>Hier ist Platz für Text</h3>
        <p>Nascetur per nec posuere turpis, lectus nec libero turpis nunc at, sed posuere mollis ullamcorper libero ante lectus, blandit pellentesque a, magna turpis est sapien duis blandit dignissim. Viverra interdum mi magna mi, morbi sociis. Condimentum dui ipsum consequat morbi, curabitur aliquam pede, nullam vitae eu placerat eget et vehicula. Varius quisque non molestie dolor, nunc nisl dapibus vestibulum at, sodales tincidunt mauris ullamcorper, dapibus pulvinar, in in neque risus odio. Accumsan fringilla vulputate at quibusdam sociis eleifend, aenean maecenas vulputate, non id vehicula lorem mattis, ratione interdum sociis ornare. Suscipit proin magna cras vel, non sit platea sit, maecenas ante augue etiam maecenas, porta porttitor placerat leo.</p>
    </div>

    <div class="bgimg-2">
        <div class="caption">
            <span class="border">Hier ist Platz für ein Bild</span>
        </div>
    </div>

    <div class="style-bgimg-2">
        <h3>Hier ist Platz für Text</h3>
        <p>Nascetur per nec posuere turpis, lectus nec libero turpis nunc at, sed posuere mollis ullamcorper libero ante lectus, blandit pellentesque a, magna turpis est sapien duis blandit dignissim. Viverra interdum mi magna mi, morbi sociis. Condimentum dui ipsum consequat morbi, curabitur aliquam pede, nullam vitae eu placerat eget et vehicula. Varius quisque non molestie dolor, nunc nisl dapibus vestibulum at, sodales tincidunt mauris ullamcorper, dapibus pulvinar, in in neque risus odio. Accumsan fringilla vulputate at quibusdam sociis eleifend, aenean maecenas vulputate, non id vehicula lorem mattis, ratione interdum sociis ornare. Suscipit proin magna cras vel, non sit platea sit, maecenas ante augue etiam maecenas, porta porttitor placerat leo.</p>
    </div>

    <div class="bgimg-3">
        <div class="caption">
            <span class="border">Hier ist Platz für ein Bild</span>
        </div>
    </div>

    <div class="style-bgimg-3">
        <h3>Hier ist Platz für Text</h3>
        <p>Nascetur per nec posuere turpis, lectus nec libero turpis nunc at, sed posuere mollis ullamcorper libero ante lectus, blandit pellentesque a, magna turpis est sapien duis blandit dignissim. Viverra interdum mi magna mi, morbi sociis. Condimentum dui ipsum consequat morbi, curabitur aliquam pede, nullam vitae eu placerat eget et vehicula. Varius quisque non molestie dolor, nunc nisl dapibus vestibulum at, sodales tincidunt mauris ullamcorper, dapibus pulvinar, in in neque risus odio. Accumsan fringilla vulputate at quibusdam sociis eleifend, aenean maecenas vulputate, non id vehicula lorem mattis, ratione interdum sociis ornare. Suscipit proin magna cras vel, non sit platea sit, maecenas ante augue etiam maecenas, porta porttitor placerat leo.</p>
    </div>

    <div class="bgimg-1">
        <div class="caption">
        <span class="border">Kontakt</span>
        </div>
      </div>

</body>
</html>
!

CSS 

              
                * {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;

}

body,h1,h2,h3,h4,h5,h6 {
    font-family: "Lato", sans-serif;
}

body, html {
    height: 100%;
    color: #777;
    line-height: 1.8;
}

h3 {
    text-align: center;
}

/*--------------------------------Navigation-----------------------*/

.navbar {
    position: sticky;
    width: 100%;
    overflow: hidden;
    background-color: transparent;
    box-shadow: 2px 2px 2px 2px black;
  }
  
  .navbar a {
    float: left;
    display: block;
    color: black;
    text-align: center;
    padding: 14px 50px;
    text-decoration: none;
    font-size: 17px;
  }
  
  .navbar a:hover {
    background-color: grey;
    color: white;
  }
  
  .navbar a.active {
    background-color: grey;
    color: white;
  }
  
  .navbar .icon {
    display: none;
  }
  
  @media screen and (max-width: 600px) {
    .navbar a:not(:first-child) {display: none;}
    .navbar a.icon {
      float: right;
      display: block;
    }
  }
  
  @media screen and (max-width: 600px) {
    .navbar.responsive {position: relative;}
    .navbar.responsive .icon {
      position: absolute;
      right: 0;
      top: 0;
    }
    .navbar.responsive a {
      float: none;
      display: block;
      text-align: left;
    }
  }

  ..bgimg-1, .bgimg-2, .bgimg-3 {
      padding: 16px;
  }

  .sticky {
      position: fixed;
      top: 0;
      width: 100%;
  }

  .sticky + .bgimg-1, .bgimg-2, .bgimg-3, .caption, .border, .style-bgimg-1, .style-bgimg-2, .style-bgimg-3 .caption span.border {
      padding-top: 60px;
  }

/*----------------------------Parallax-----------------------*/

.bgimg-1, .bgimg-2, .bgimg-3 {
    position: relative;
    opacity: 0.80;
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

.bgimg-1 {
    background-image: url("img/skyline.jpeg");
    min-height: 100%;
}

.bgimg-2 {
    background-image: url("img/women_free.jpeg");
    min-height: 600px;
}

.bgimg-3 {
    background-image: url("img/office_girl.jpeg");
    min-height: 600px;
}

@media only screen and (max-device-width: 1600px) {
    .bgimg-1, .bgimg-2, .bgimg-3 {
        background-attachment: scroll;
        min-height: 400px;
    }
}

img {
    width: 10%;
}

.caption {
    position: absolute;
    left: 0;
    top: 35%;
    width: 100%;
    text-align: center;
    color: #000;
}

.caption span.border {
    background-color: #111;
    color: #fff;
    padding: 18px;
    font-size: 25px;
    letter-spacing: 10px;
  }

.border-img {
    color: #fff;
    padding: 18px;
    font-size: 25px;
    letter-spacing: 10px;
  }

.border {
    background-color: transparent;
    font-size: 25px;
    color: #f7f7f7;
}

.style-bgimg-1 {
    color: #777;
    background-color: white;
    text-align: center;
    padding: 50px 80px;
    text-align: justify;
  }

.style-bgimg-2  {
    position: relative;
    color: #ddd;
    background-color: #282e34;
    text-align: center;
    padding: 50px 80px;
    text-align: justify;
}

.style-bgimg-3 {
    position: relative;
    color: #ddd;
    background-color: #282e34;
    text-align: center;
    padding: 50px 80px;
    text-align: justify;
}
!

JS 

              
                function myFunction() {
    var x = document.getElementById("myTopnav");
    if (x.className === "navbar") {
      x.className += " responsive";
    } else {
      x.className = "navbar";
    }
  }

  /*--------------------------------------*/

window.onscroll = function() {myFunction()};

// Get the navbar
var navbar = document.getElementById("navbar");

// Get the offset position of the navbar
var sticky = navbar.offsetTop;

// Add the sticky class to the navbar when you reach its scroll position. Remove "sticky" when you leave the scroll position
function myFunction() {
  if (window.pageYOffset >= sticky) {
    navbar.classList.add("sticky")
  } else {
    navbar.classList.remove("sticky");
  }
}
!
999px

Console