Text colour and background colour in twenty eleven

Hi I hope someone can help with two Twenty Eleven styling problems that I’ve been unable to solve despite trying to implement suggestions already on this forum.

I have created a child theme and successfully made changes to it but am stuck trying to:

1. Change the default colour for all text to white (it is a light grey at the moment). I’ve tried

body, input, textarea {

    color: #FFFFFF;

}

2. Change the colour of the background behind the text to black (it is currently dark grey)

I’ve tried putting all of these in:

#page {
   background-color: #000000;
}

#page {
	background: #000000;
}

#site-generator {
	background: #000000;

The site is at http://dirtystuff.17sightlines.com/

If anyone can help, I’d be thrilled.

PS: Yes, I’ve created a child theme and yes I have searched for (and applied) suggestions from this forum.