.comprobar {
  border: 2px solid rgba(0,0,0,.3);
  border-radius: 10px;
  box-shadow: 2px 2px 3px rgba(0,0,0,.3);
  background-color: #ffffff;
}
.correcto {
  border: 2px solid rgba(33,191,115,0.7);
  border-radius: 10px;
  box-shadow: 2px 2px 3px rgba(33,191,115,0.7);
}
.incorrecto {
  border: 2px solid rgba(217,32,39,0.7);
  border-radius: 10px;
  box-shadow: 2px 2px 3px rgba(217,32,39,0.7);
}