How to change the background color of a HTML page for printing?

Question

I want to make my website properly printable. The body of the HTML document has a background color other than white.

body {
  background-color: #F8F6F6;
}

The problem is that some parts of the background of the printed page (the margins and the part after the document end) are white as shown below:

How can I change the color of these areas?

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Edit (clarification):

I want to change the color of white areas in the picture to #F8F6F6, not the opposite.

Answer 1

css printing

   @media print{
     body {
       background-color: #FFFFFF;
     }
   }