Resharper: Unit of measure is redundant
0cm, 0px or 0x corresponding to 0, it doesn't need unit if it's of the same order of magnitude. 0px * 10cm is the same than 0 * 10cm.
In this case border-width corresponding to length's order of magnitude it's not necessary to precise the units.

Moreover, for my part, I never specifies the things which are default. Whatever the language. I think it's more readable and elegant. It's my opinion because some people I met prefers specify everything.

I hope my english is not so bad .