Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.14)
// Compass (v1.0.1)
// ----

.btn {
  font-weight: bold;
  &:focus {
    font-style: italic;
  }
    &.dark,
  .dark {
    &:focus {
      box-shadow: 0 0 0 3px rgba(177, 213, 249, 0.3);
    }
    &:active {
      box-shadow: none;
    }
  }

}
 
.btn.dark{
  color: black;
}

.btn.dark.filled {
  background-color: white;
  
}
.blah {
  @extend .btn;
}

SassMeister-output.css

.btn, .blah {
  font-weight: bold;
}
.btn:focus, .blah:focus {
  font-style: italic;
}
.btn.dark:focus, .dark.blah:focus,
.btn .dark:focus,
.blah .dark:focus {
  box-shadow: 0 0 0 3px rgba(177, 213, 249, 0.3);
}
.btn.dark:active, .dark.blah:active,
.btn .dark:active,
.blah .dark:active {
  box-shadow: none;
}

.btn.dark, .dark.blah {
  color: black;
}

.btn.dark.filled, .dark.filled.blah {
  background-color: white;
}