gistfile1.txt

@function em($target-size-in-px, $px-context: $base-font-size){
  @return #{$target-size-in-px/$px-context}em;
}

@mixin section-flag($color: $accent-blue) {
  background: $color;
  position: absolute;
  top: 0;
  left: 0;
  margin: 0;
  padding: 0.25em 1em;
  color: #fff;
  font-family: $proxima-lite;
  font-size: em(15px);

  // if we wanted a nested element to be 20px:
  // font-size: em(20px, 15px);
}