title: Keeping div's width same as wrapper, but making the background full width
body: <p>The image shows what I'm trying to accomplish. All 3 divs are contained in a wrapper that's 800px. But the second div's background extends the full width of the body.</p>
  
  <p><img src="https://i.stack.imgur.com/DLbKy.jpg" alt="enter image description here"></p>