css in contact form 7

Question

I’m using contact form 7 at (https://petspa.vet.br/contact/) and the return of submission is with the blank source:

.wpcf7 .wpcf7-response-output {
  margin: 30px 0 0;
  padding: 15px 20px;
  border: 0;
  color: #ffffff;
}

I already changed the color in the theme’s style.css and it still returns to #ffffff

.wpcf7 .wpcf7-response-output {
  margin: 30px 0 0;
  padding: 15px 20px;
  border: 0;
  color: #19191a;
}