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Html, Css Background Not Showing

This is probably a really stupid question, but my background for my nav div wont show, I really don't know the problem to this, the css file is linked and working with some elements.

Image Properties Size: 10kb -Bit Depth: 32 -Dimensions: W:300 H:190 -File Type: png -Name: Nav_Background

What it needs to do http://prntscr.com/l89oq0

Index.html

<!DOCTYPE html>
<html>
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width,initial-scale=1">

   <title>Portfolio Template</title>

   <meta name="author" content="name">
   <meta name="description" content="description here">
   <meta name="keywords" content="keywords,here">
   <link rel="shortcut icon" href="favicon.ico" type="">
   <link rel="stylesheet" href="main.css" type="text/css">
 </head>
 <body>

   <div class="nav">

   </div>

   </div>
  </body>
</html>

main.css

                /*----------Global----------*/
            * {
                margin: 0;
                padding: 0;
                border: 0;
                outline: 0;
                font-size: 100%;
                vertical-align: baseline;
                background: transparent;
            }

            .clearfix::after{
            content: "";
            clear: both;
            display: table;
            }
            html{
                font-family: circular std, sans-serif;
                font-weight: 100;
            }
            body{
                width: 100%;
                margin: auto;
                background: white; /*Replace with background image
                background-position: top;
                background-size: cover;
                background-repeat: no-repeat;*/
            }

            /*----------Navigation----------*/
            .nav {
                background-image: url(images/Nav_Background.png);
                background-position: right top;
                background-size: 300px 191px;
                margin-top: 5px;
            }

<div class="nav"> (and if you are using a class named nav you should really be asking yourself if you should be using a <nav> element instead) has no content or anything else that would give it a height.

With no height, there are no pixels to paint the background on.

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