Gettysburg Address

• Download the exercise files.
• Alter the stylesheet to hide the contents of the page initially. When the page is loaded, fade in the contents slowly.
• Give each paragraph a yellow background only when the mouse is over it.
• Set up a click event on every <h2> element that simultaneously fades it to 25 percent opacity while growing its left-hand margin to 20px. Then, when this animation is complete, fade the speech text to 50 percent opacity.
• Bonus: Make the style switcher work.
• Challenge: React to presses of the arrow keys by smoothly moving the switcher box 20 pixels in the corresponding direction. The key codes for the arrow keys are: 37 (left), 38 (up), 39 (right), and 40 (down).