Perhaps an amateur question, just started using CSS w3c validated but I'm having issues on multiple sites I have created wherein a gray line shows up between divs

Of course it's only on Internet Explorer.. grr

I think its a simple issue but google isn't helping me. Tips anyone?

Example: http://emptyset.heritagewebdesign.co...7/custom/HTML/

I cant really see any problems, have you fixed it?

if not try adding classes to the divs and make sure you set margin and padding to 0px for both the top and the bottom of each div.