Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.1)
// Compass (v0.13.alpha.7)
// ----

@import "compass";

@mixin size-2xl {
    @include rem(font-size, 40px);
}
@mixin size-3xl {
    @include rem(font-size, 60px);
}

.heading1 {
    @include size-3xl;
}
.heading1-small {
    @extend .heading1;
    @include size-2xl;
}

SassMeister-output.css

.heading1, .heading1-small {
  font-size: 60px;
  font-size: 3.75rem;
}

.heading1-small {
  font-size: 40px;
  font-size: 2.5rem;
}