.btn {
  &-submit {
    background-color: #0a0;
  }
  &-custom-action {
    background-color: #a00;
  }
}

.btn-submit {
  background-color: #0a0;
}
.btn-custom-action {
  background-color: #a00;
}

h {
  &1 {
    font-size: 3rem;
  }
  &2 {
    font-size: 2.4rem;
  }
  &3 {
    font-size: 2rem;
  }
  &r {
    border-top: 1px solid #000;
    height: 0;
  }
  &eader {
    background-color: #f8f8f8;
  }
}

h1 {
  font-size: 3rem;
}
h2 {
  font-size: 2.4rem;
}
h3 {
  font-size: 2rem;
}
hr {
  border-top: 1px solid #000;
  height: 0;
}
header {
  background-color: #f8f8f8;
}