How to access the required class?

Question

Sass

There are for example classes:
.btn, .obr {
display: block;
// something like .btn {
//font-size: 24px;
//}
}
and I need to refer only to .btn inside, so as not to write separately for it, but write inside the brackets
and so that the compilation
outputs .btn,.obr{
display:block;
}
.btn {
font-size: 24px;
}

Answer 1

.btn,
.obr {
  display:block;
  @at-root {
    .btn {
      font-size: 24px;
    }
  }
}

https://sass-scss.ru/documentation/pravila_i_direk...