In this lesson you're goal is to create this. Before you actually try it, you need a bit of information first.
1st Hint: Since you're editing a property of the body tag, you need to give the body an id so it can be identified.
2nd Hint: The property for background color is "style.background". So, say I wanted to change the background to black, I would do something like: document.getElementById("[whateverthebodyidis]").style.background="black" .
3rd Hint: it's always good to think about all of what you have to do before you try writing code. In this scenario - you'll have a function that takes one variable ( function changecolor(variable){). In that function you'll say that the document's background should be changed to that variable. You'll also have two inputs - one for red, and one for blue. If someone clicks on the red button, it should call your function (onclick=) with the variable being, 'red'. And the blue button should be exactly the same, except it should submit the variable being 'blue'.
If you have no idea what you're supposed to do don't worry, this is a lot of information we're throwing at you. If you get frustrated first look around at lesson 2 and lesson 1, and see if there's anything that can help. If that doesn't help - then look at the solution, then go back to your code and try and figure out where you went wrong.
Congratulations, you have finished Lesson 3;