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Div not showing up in javascript?

I'm doing the odin project and for the front-end webdev project, I have to create a grid using javascript/jQuery. I tried using the createElement method but I was wondering how I would be able to make the div visible in html? Am I going about this all wrong?

HTML:

<!DOCTYPE html>
    <html>

    <head>
        <title>Etch-a-Sketch</title>
        <link rel="stylesheet" type="text/css" href="etch-a-sketch.css">

        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>

        <script type = "text/javascript" src="etch-a-sketch.js"></script>

    </head>

    <body>


    </body>

</html>

JS:

var div = document.createElement("div");
div.style.width = "100px";
div.style.height = "100px";
div.style.color = "blue";

document.body.appendChild(div);

Add background-color

var div = document.createElement("div");
div.style.width = "100px";
div.style.height = "100px";
div.style.color = "blue";

div.style.backgroundColor = "yellow";//you forgot background color

document.body.appendChild(div);

Add more styling to make it visible, such as a border or background color.

 var div = document.createElement("div"); div.style.width = "100px"; div.style.height = "100px"; div.style.color = "blue"; div.style.backgroundColor = "blue"; document.body.appendChild(div); 

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