[-1vw] compiles into [-1 vw]

[saturday1]

Hello!

I have a problem that when I write:

margin-left: -1vw;

It compiles into:

margin-left: -1 vw;

And it failes in the browser as a typo. Observe the space between the number [1] and the unit [vw]

Anyone have a solution for it?

Ps. I seems to have to be minus and vw. -10px seems to compile without space.