Webkit perspective transform cuts through another div

A 3d rotated div cuts through another div with a higher z-index. I would like to prevent this, and force adheren开发者_运维问答ce to z-index definitions. I thought -webkit-transform-style: flat; would solve this. Anyone got a suggestion?

Since you have not a fiddle so that we could look around this issue, but I can point you to a link which may be useful for you to figure out the issue:

http://css3.mikeplate.com/