resources/public/index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>sudoku</title>
    <style>
      .cell {
          width: 40px;
          height: 40px;
          margin: 5px;
          padding: 5px;
          border-radius: 4px;
          font-size: 18px;
          text-align: center;
          border: 2px solid #333;
          outline: none;
      }
      
      .cell:hover {
          border-color: #00a;
      }
      
      .cell:focus {
          border-color: #00f;
      }
      
      .cell.block-border-right {
          border-right: 4px solid #000;
      }
      
      .cell.block-border-bottom {
          border-bottom: 4px solid #000;
      }
      </style>
  </head>
  <body>
    <noscript>
      sudoku is a JavaScript app. Please enable JavaScript to continue.
    </noscript>
    <div id="app"></div>
    <script src="/js/compiled/app.js"></script>
  </body>
</html>