Generated by SassMeister.com.

SassMeister-input.scss

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

@function strip-unit($value) {
	@return $value / ($value * 0 + 1);
}

@function em($px, $base: $font-size) {
  @return (strip-unit($px) / strip-unit($base)) * 1em;
}

$font-size: 16px;
$line-height: em($font-size * 1.5);
$em: em($font-size);

.em {
  line-height: $em;
}

@mixin huge {
	/* 42px / 48px */
	font-size: em(42);
	line-height: $line-height * 2; //48px
}
h1 {
	@include huge;
}

@mixin large {
	/* 26 / 36px */
	font-size: em(26px);
	line-height: $line-height * 1.5; // 36px/2.25em
}
h2 {
  @include large;
}

SassMeister-output.css

.em {
  line-height: 1em;
}

h1 {
  /* 42px / 48px */
  font-size: 2.625em;
  line-height: 3em;
}

h2 {
  /* 26 / 36px */
  font-size: 1.625em;
  line-height: 2.25em;
}