Problem with Valid HTML 4.01 icon

Hi,

I've checked the validity of my web page and added the W3C's valid HTML 
4.01 icon to my page.

I've noticed that it does not appear to have a transparent background so 
does not appear the same as the W3C valid CSS icon which I have put 
right next to it. There is a narrow slice of white background behind the 
tick in the valid html icon.

The icon in question is: http://www.w3.org/Icons/valid-html401.

The web page where the problem can be seen is: 
http://www.orientalstyle.com.au

Yours Sincerely
Ben Thomas