itch.io

I don't think I have access to custom CSS but would just like to point out that nesting CSS blocks iare currently being developed into a part of the CSS standard and are already supported by many browsers: https://drafts.csswg.org/css-nesting-1/

Without nesting, the equivalent to 

#wrapper {
    .my-class {
        ...
    }
}

would just be

#wrapper .my-class { ... }