mixins of FizzBuzz by Sass

_fizzbuzz.scss

@mixin fizzbuzz_content($n) {
    $fb: '', '', Fizz, '', Buzz, Fizz, '', '', Fizz, Buzz, '', Fizz, '', '', FizzBuzz;
    $cont: '';
    @for $i from 1 through $n {
        @if nth($fb, ($i - 1) % 15 + 1) == '' {
            $cont: $cont + $i + ' '
        } @else {
            $cont: $cont + nth($fb, ($i - 1) % 15 + 1) + ' ';
        }
    }
    &:after { content: $cont; }
}

@mixin fizzbuzz_nth($fs: 18px) {
    li {
        font-size: $fs;
        display: inline-block;
    }
    li:nth-child(3n), li:nth-child(5n) {
        font-size: 0;
    }
    li:nth-child(3n):before {
        font-size: $fs;
        content: "Fizz";
    }
    li:nth-child(5n):after {
        font-size: $fs;
        content: "Buzz";
    }
}