index.html

<!DOCTYPE HTML>
<html>
  <head>
    <script src='app.js'></script>
    <link href="style.css" rel="stylesheet">
  </head>
  <body>
    <h1>Tic Taco</h1>
    <div id='board'>
      <!-- the `&nbsp;` in each div is a non-breakable space.
           It prevents the div from collapsing. -->
      <div id='topLeft' class='box'>&nbsp;</div>
      <div id='topMid' class='box'>&nbsp;</div>
      <div id='topRight' class='box'>&nbsp;</div>
      <div id='midLeft' class='box'>&nbsp;</div>
      <div id='midMid' class='box'>&nbsp;</div>
      <div id='midRight' class='box'>&nbsp;</div>
      <div id='botLeft' class='box'>&nbsp;</div>
      <div id='botMid' class='box'>&nbsp;</div>
      <div id='botRight' class='box'>&nbsp;</div>
    </div>
    <button id="reset">Reset</button>
  </body>
</html>