Generated by SassMeister.com.

input.scss

.stuff {
    $color: #808080;
    color: $color;
    color: #{fade-out($color, .5)};
    $color2: #80808080;
    color: #{fade-out($color2, .25)};
}

output.css

.stuff {
  color: #808080;
  color: rgba(128, 128, 128, 0.5);
  color: rgba(128, 128, 128, 0.2519607843);
}

settings.json

{
  "sass": {
    "compiler": "dart-sass/1.32.12",
    "extensions": {},
    "syntax": "SCSS",
    "outputStyle": "expanded"
  },
  "autoprefixer": false
}