#btn_calcular {
  background-color: #c0392b !important;
  color: #ffffff !important;
  border-color: #c0392b !important;
}
#btn_calcular:hover {
  background-color: #a93226 !important;
  border-color: #a93226 !important;
}
.required {
  color: #f87171;
  margin-left: 4px;
}