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CSS

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HTML 

              
                <html>
<head>
    <title>Pixel Art Maker!</title>
    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Press+Start+2P">
    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Bungee+Shade">
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <h1>@drcpmcg's</h1>
    <h2>Pixel Canvas</h2>

    <div class = "settings">
    <h3><strong>INSTRUCTIONS</strong></h3>
    <h3>1. Choose Grid Size</h3>
      <form id="sizePicker">
          Grid Height:
          <input type="number" id="inputHeight" name="height" min="1" max="50" value="1">
          Grid Width:
          <input type="number" id="inputWeight" name="width" min="1" max="50" value="1">
          <input type="submit" value="create canvas">
          <p>(To clear the grid, press "create canvas" button again.)</p>
      </form>

      <h3>2. Pick a Color</h3>
      <input type="color" id="colorPicker">
      <p>(On Mac OS, re-select a custom color with the "eyedropper" tool in the color picker.)</p>
      <p>(On Windows, use the "Add to Custom Colors" button to enable re-selection.)</p>
      <h3>3. Click Pixels to Build Designs!</h3>
      <p>(To erase a pixel, double click on it.)</p>
    </div>
    <div class = "canvas">
      <table id="pixelCanvas"></table>
    </div>
    <script
			  src="https://code.jquery.com/jquery-3.3.1.min.js"
			  integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
			  crossorigin="anonymous"></script>
    <script src="designs.js"></script>
</body>
</html>
!

CSS 

              
                body {
    text-align: center;
    background-image:
    url('https://static.pexels.com/photos/100864/pexels-photo-100864.jpeg');
    /* Photo by Saulo Zayas from Pexels https://www.pexels.com/photo/35mm-film-grain-texture-100864/ */
    background-color: none;
}

h1 {
    text-align: center;
    font-family: "Bungee Shade";
    font-size: 50px;
    margin: 0.2em;
}

h2 {
    text-align: center;
    font-family: "Press Start 2P" ;
    font-size: 64px;
    margin: 0.2em;
    background: linear-gradient(90deg,#ff0000 0%, #0031ff 80%);
}

.canvas {
    padding: 20px;

}

.settings {
  
    box-sizing: border-box;
    text-align: center;
    display: inline-block;
    border: 10px ridge #000000;
    padding: 10px;
    background: #ffffff;
    box-shadow: 10px 10px 16px 7px rgba(0,0,0,0.75);
}

h3 {
    margin: 1em 0 0.25em;
}

h3:first-of-type {
    margin-top: 0.5em;
}

table,
tr,
td {
    border: 1px solid black;
    background-color: white;
}

table {
    border-collapse: collapse;
    margin: 0 auto;
}

tr {
    height: 20px;
}

td {
    width: 20px;
    background-color: white;
}

input[type=number] {
    width: 6em;
}
!

JS 

              
                var canvas = $("#pixelCanvas");


function makeGrid() {
  var row = $("#inputHeight").val();
  var col = $("#inputWeight").val();
  canvas.find("*").remove();
  for (var x = 0; x < row ; x++){
    canvas.append("<tr></tr>");
    for (var y = 0 ; y < col ; y++){
      canvas.children().last().append("<td></td>");
    }
  }
}

canvas.on("click", "td", function(){
  var color = $("#colorPicker").val();
    $(this).css("background-color", color);
})

canvas.on("dblclick", "td", function(){
  $(this).css("background-color", "white");
})

$("#sizePicker").on("submit", function(event){
  event.preventDefault();
  makeGrid();
})
!
999px

Console