CSS how to add fixed menu to parallax website layout

I am trying to make a parallax website with a fixed menu bar but cant figure out how to fix the menu bar at the top of the page. I tried different position values but none of them seem to work

Could really use some help here! Im stuck.. Doing this for free and its for a nice guy whom I sure will appreciate it!

https://jsfiddle.net/p3osoddq/

CSS

* {
  margin: 0px;
  padding: 0px;
}

html, body {
  height: 100%;
  font-family: "Arial, Helvetic Neue, Helvetic, monospace";
  font-weight: normal;
  font-size: 16px;
}


.navigation {
  position: relative;
  top:0;
  background-color:white;
  width:100%;
  height:120px;
}

.block-one, .block-two, .block-three {
  position: relative;
  opacity: 0.65;
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

.block-one {
  background-color: blue;
  min-height: 100%;
}

.block-two {
  background-color: green;
  min-height: 70%;
}

.block-two-header {
  position: relative;
  background-color: #ffffff;
  color: #777777;
  min-height:30%;
  display:flex;
  align-items: center; /* Vertical center alignment */
  justify-content: center; /* Horizontal center alignment */
}
.block-two-header h3 {
  padding-bottom:20px;
  text-align: center;
}

.block-two-header p {  
  text-align: center;
  line-height: 25px;
  padding: 0px 50px;
}

.block-three {
  background-color: red;
  min-height: 400px;
}

HTML

<!doctype html>
<html>

  <head>
    <link type="text/css" href="style.css" rel="stylesheet"/>
    <title>Home</title>
  </head>

  <body>

        <div class="navigation">

        </div>

        <div class="block-one">
        </div>

        <div class="block-two-header">
          <span>
          <h3>Parallax Demo</h3>
          <p>
            Parallax scrolling is a web site trend where the background content is moved at a different speed than the 
            foreground content while scrolling. 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>
          </span>
        </div>

        <div class="block-two">
        </div>

        <div class="block-three">
        </div>

        <div class="block-one">
        </div>

  </body>

</html>

Solution

Edit this in your css. Adding padding-top to your body won't hide the upper part of your parallax.

Here's the working fiddle

body{
  padding:120px 0 0 ;
}

.navigation {
  position:fixed;
  z-index:100;
  top:0;
  background-color:white;
  width:100%;
  height:120px;
}