How to fix layout problem in firefox?

Question

css

Hello!
In fox, the legend property is displayed incorrectly, through css I indicate to it that it should be in the middle, but for some reason it rises to the left in the corner.
In other browsers it is displayed normally (even in ie8!)
here is how

the site
v.testjay.esy.es should be

Answer 1

Isn't it possible to spend a little time and search?
I clicked on the first link and a solution to your problem is described there, because the request is the simplest, isn't it?
three words: firefox legend center and immediately a bunch of answers, even knowledge of English is not needed, search, find the answer and look at the code (in 80% of cases the code is separated into a separate block that even a distant person will find), try the code.
So probably spend less time than adding a question and explaining what's what, and then wait for an answer)