How to change the default units in webstorm (em to px)?

Question

css

In general, guys, I've been working in webstorm for about a year and just now I started to configure it in all its subtleties :)
The essence of the question is as follows. when using liveTemplates abbreviations, in principle, everything is clear and figured out, but! If you write like this: "w10 + TAB" - it will be like this "width: 10px" , and if with tenth hundredths: "w10.15" - "width: 10.15em" . How do I change em to px? Or how to write your own liveTemplate