Generated by SassMeister.com.

input.scss

@mixin flex($justify-content:false){
    display:flex;
    @if $justify-content {
        justify-content: $justify-content;
    }
}

body{
    @include flex;
}

.body{
    @include flex(center);
}

output.css

body {
  display: flex;
}

.body {
  display: flex;
  justify-content: center;
}

settings.json

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