CSS background not covering the transparent PNG file

I have this testing website that uses Coda Slider over he开发者_StackOverflowre.

The problem is that the grey background on the 3 PNG images (below the sliding images) only covers the bottom part of the images whereas I wanted the whole image covered with the background.

Help?

I see the problem. Here's the solution:

ul.navigation li a { display:inline-block; }

Add that to your css.