Generated by SassMeister.com.

input.scss

.username {
  color: red;

  .mobile & {
    font-weight: bold
  }
  
  .desktop & {
    font-weight: normal
  }
}

output.css

.username {
  color: red;
}
.mobile .username {
  font-weight: bold;
}
.desktop .username {
  font-weight: normal;
}

settings.json

{
  "sass": {
    "compiler": "dart-sass/1.26.11",
    "extensions": {},
    "syntax": "SCSS",
    "outputStyle": "expanded"
  },
  "autoprefixer": false
}