Polyvore button now behaving!In the product grid below, you can see that the trouble I was having with the Polyvore button has now gone.
What was happening was that on Blogger blogs with certain themes, and possibly other places I don't know of yet, the Polyvore button had a border and shadow, misaligning it with the other buttons.
I had a look to find out what styling my Blogger template was using and then 'zeroed' those aspects for the image that Polyvore uses as its button.
I've got to do the same for PinAProd3 - shouldn't take long.
So here's what the button looks like in place. Btw, at the time of writing these are my three most popular outer space items: