// value = px
@function rem-calc($value, $base: 16) {
  $value: calc($value/ $base) * 1rem;
  // $value:  math.div($value/ $base) * 1rem;   
  @return $value;
}

// verificar si existe un item en list
@function verify-key-header($key) {
  @return index($headers, $key);
}

@function sumar($number1, $number2) {
  @return $number1+$number2
}