Heads up too, Firefox and Chrome both had trouble setting a var to space from the dev tools css panel. So if you play with this further, you may have to deal with that.
I filed bugs to get it fixed though: https://bugzilla.mozilla.org/show_bug.cgi?id=1630488 (not fixed yet)
https://bugs.chromium.org/p/chromium/issues/detail?id=107129... (fixed!)
And minifiers hate it. lol