I'm not real sure where you want the image to be displayed. ??? The only image I found was the one in the 'full' css class.
.full {
background :url(http://wallpapercave.com/wp/hMwO9WT.jpg);
background-size:cover;
}
And I don't see you using that class anywhere in you HTML.
Maybe I am wrong. ??? I think you need to put class="full" on one of you components. If you want the image on the body, put that there.