Hello,
How should I do transparent border?
In CSS 3 I did "border: 1px solid rgba(0,0,0,0.3);"
I tried to do:
"-pie-border: 1px solid rgba(0,0,0,0.3);"
but didn't work.
Some idea?

RGBa colors are not (yet) supported by PIE: https://github.com/lojjic/PIE/issues/55

so do you have any idea how it does?

Sorry I don't understand your question. Do I have any idea how what does what?

what should I do to obtain transparent in border?

Better?

Thanks for clarifying. My original answer was attempting to tell you that, as far as I know, there is no way to do this.

That said, you might be able to achieve a similar effect by not using a border, but using a box-shadow with a positive spread value instead. That usually results in something that looks just like a solid border, and as long as you don't specify a blur radius you can use an rgba color there.

box-shadow it looks diffrent, but I will check it tomorrow, do you plan add rgba for border? because i bacground it wokrs, maybe this same function you can use to border?

Please see the ticket I linked to for discussion on possible implementation. I haven't given any more consideration than what is discussed there.

Thanks for the link, I had basically the same question.