Change widget background color

Hi! We are trying to change the background color of our widgets. I added the code

.widget {
background-color: #FFCCAA;
}

to our Custom CSS for our theme. Our widget then looks like this: http://oi40.tinypic.com/2vkc8p2.jpg

You see the problem, we want to change the actual background (the grey area). And not just the areas that you see now. What are we doing wrong?

Thank you!