Time for action – creating a game over dialog with the elapsed played time

We will continue with the code from the card matching game we made in Chapter 3, Building a Card-matching Game in CSS3. Carry out the following steps:

1. Open the CSS3 matching game folder as our working directory.

2. Download a background image from the following URL (we will use it as the background of the popup): http://mak.la/book-assets

3. Place the image in the images folder.

4. Open index.html in any text editor.

5. We will need a font for the game over popup. Add the following font embedding CSS into the head section:

   <link href="http://fonts.googleapis.com/css?family=Orbitron:400,700" rel="stylesheet" type="text/css">

6. Before the game section, we add a div named timer to show the elapsed playing time. In addition, we add a new popup section containing the HTML markup of the pop-up dialog:

   <div id="timer">
      Elapsed time: <span id="elapsed-time">00:00</span>
   </div>
   <section id="game">
      &lt...