Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.7)
// Compass (v1.0.1)
// ----

.spaVoucher {
    font-size: 12px;
    &__heading {
      font-size: 16px;
      &--blue {
        color: blue;
        &-underline {
          text-decoration: underline;
        }
      }
    }
  }

SassMeister-output.css

.spaVoucher {
  font-size: 12px;
}
.spaVoucher__heading {
  font-size: 16px;
}
.spaVoucher__heading--blue {
  color: blue;
}
.spaVoucher__heading--blue-underline {
  text-decoration: underline;
}