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.thing, .thing-3 {
  background: red;
  color: white;
  font-size: 18px;
}

.thing-2, .thing-3 {
  font-weight: 800;
  max-width: 500px;
  margin: 0 auto;
  overflow: hidden;
}

// ----
// Sass (v3.4.12)
// Compass (v1.0.3)
// ----

.thing {
  background: red;
  color: white;
  font-size: 18px;
}

.thing-2 {
  font-weight: 800;
  max-width: 500px;
  margin: 0 auto;
  overflow: hidden;
}

.thing-3 {
  @extend .thing, .thing-2;
}