1. In layout.css, insert formatting that changes the background color of the navbar links when the mouse pointer hovers on top of them:

    #navbar li a:hover {
    background: #ffff00;
    color: #000000;
    }
  2. Save format.css and advlayout.html.

    Reload advlayout.html in the browser.

    It should look like this:

  3. Rest the cursor on the PDAs link.

    It should look like this: