.mitarjeta{
  background-color: red;
  padding: 2em;
  border-radius: 4px;
  border:2px solid white;
  box-shadow: 0px 9px 20px rgba(0,0,0,0.3);
  display: flex;
  flex-direction: column;
}

.mitarjeta h2, .mitarjeta a{
  color:white;
  text-align: center;
}