Post-image shadow question

Hi,

I’m using this code to create shadows for my post images. However, there’s a white border at the bottom of the images which I don’t want. Take a look: http://24thmarch.com/scrapbooks/

Below is the code that I use on my CSS:

.post-image {
	max-width: 100%;
	margin: 8px 8px 8px 8px;
	padding: 0px;
	-moz-box-shadow: 0 0 5px #888;
	-webkit-box-shadow: 0 0 5px #888;
	box-shadow: 0 0 5px #888;

Does anyone know what’s wrong with the code? I’m trying to remove the white border at the bottom of the images.