Check out the preview window. All looks well and good, except for #4—that's nonsense!
Create a variable called $target in script.js and use the = sign to assign it to the jQuery selector that represents #4 in the ordered list. When you run your code, it should fade away!
You're going to need your CSS knowledge for this one and there is more then one way to achieve this. Check the Hint if you need a reminder!