Print css

I have created the css style sheet for printing my website. I have literally copied over my original css file and changed aspects of the site to display none: for the un-necessary things to print of when on my site, i.e. the nav bar etc colours etc.
Here is the code:

Here is the end result. As you can see no colour is displayed and the nav bar and footer have gone. Lastly, i have made another 3 print style css sheets for i.e. All works well for them as well.