I am building a responsive page layout and it works great so far, but I have a question:

Should I be using em, px or %?

For example, I want to have border radius applied to an element. Should I use this code: 

border-radius: 1.563em;

Or this:

border-radius: 25px;

Should I be using ems for similar properties or should I stick with px?

css layout responsive-design
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