Make Div 100% of grandparent container?

Question

Here\'s the problem I have:-

I have one div that is set to a max width of 960px.

The width of the div inside the div is set to 100%, but 100% means a max of

Answer 1

How about using absolute position

 .child-div {
     position:absolute;
     left:0;
     right:0;
 }