How to Set an if in css for opera browser? [duplicate]

Question

This question already has answers here:

How to make CSS visible only for Opera (13 answers)

Closed 9 years ago.

How can have a custom css file for just opera browser ?

Something like IF IE.

I want to have a special one for opera.

Answer 1

You may use the -o-prefocushack test this in a opera browser to see the difference

<p>HELLO WORLD</p>

p { font-size: 20px;  }
-o-prefocus, p{
       font-size: 90px;
}