// Base font size in pixels $base-font-size: 16;

// Convert pixels to em @function pem($px, $base: $base-font-size) {

@if (unitless($px)) {
  $px: $px * 1px;
}

@if (unitless($base)) {
  $base: $base * 1px;
}

@return $px / $base * 1em;

}