Generated by SassMeister.com.

input.scss

.o-layout  {
    &-three-columns {
        width: 33.333%;
    }
}

output.css

.o-layout-three-columns {
  width: 33.333%;
}

settings.json

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