fix malformed CSS that was breaking production builds
fix malformed CSS that was breaking production builds

no issue
- cssnano was erroring with `Error: Unexpected "space" found`

acburdine/Ghost-Admin,JohnONolan/Ghost-Admin,kevinansfield/Ghost-Admin,kevinansfield/Ghost-Admin,TryGhost/Ghost-Admin,TryGhost/Ghost-Admin,JohnONolan/Ghost-Admin,acburdine/Ghost-Admin