Undefined font-size variable declared in _buttons.scss

[johndavidsparrow]

Thank you for this wonderful framework. I have been attempting to compile using my own gulp setup and bringing in the neumorphism scss via my main scss root file. Getting an error in my gulp:

Error: Undefined variable: "$font-size-md"

My guess is that the following rule:

.btn-md {
    &, i {
        font-size: $font-size-md !important;
    }
}

in _buttons.scss, should either refer to $font-size-base, or that an equivalent variable should be set up in the variables file.