CSS/JS/HTML: JS Function to rotate full page?

Question

Okay, so for my final in a web class, we are just supposed to make a website do whatever we went. I'm done now and decided to add some fun stuff.

I want to use -webkit-transform: rotate(-4deg); on the body.

How can I do that in a javascript function? I have done it with the body background before, but I cannot get this to work.

Here is what I tried:

function rotatepage() {
    document.body.style.-webkit-transform =  rotate(-90deg); 
}

and

function rotatepage() {
    document.body.style =  -webkit-transform:rotate(-90deg); 
}

Any ideas? Is this possible?

Solution

Today I learned:

document.body.style.setProperty("-webkit-transform", "rotate(-90deg)", null);

Fiddle'd