It looks like you did change the backgound color, but you left the green background image.

stylesheet.css (line 329)

#navEZPagesTop {
background-color:#FFCCFF;
background-image:url(../images/tile_back.gif);
font-size:1.3em;
font-weight:bold;
margin:0;
padding:0.5em;

You will have to remove the line above highlighted in red to see the pink background. Unfortunately after you do this, you will loose the cool looking gradient effect. If you have a photo editing program, you could open and change the hue of the background image to pink.

/images/tile_back.gif