Background image for the body

I am trying to put in a background image in the main page. I edited the style.css thus:

.entry-content {
		font-size: 14pt;
		line-height: 1.6em;
		background-image: url('https://www.nandinibedi.com/wordpress/wp-content/uploads/2012/02/faint-back.gif');
	}

But I still do not see the background image. As a matter of fact, if I chnage the font-size to 8pt, I see no changes to the font size. Is .entry-content the right place to make these changes (in particular for the background image)?

Any help is most welcome,
Ravi