#tts-app {
  background: hsla(4, 84%, 49%, 1);
  background: linear-gradient(
    90deg,
    hsla(4, 84%, 49%, 1) 0%,
    hsla(37, 89%, 52%, 1) 100%
  );
  background: -moz-linear-gradient(
    90deg,
    hsla(4, 84%, 49%, 1) 0%,
    hsla(37, 89%, 52%, 1) 100%
  );
  background: -webkit-linear-gradient(
    90deg,
    hsla(4, 84%, 49%, 1) 0%,
    hsla(37, 89%, 52%, 1) 100%
  );
  width: 100%;
  height: 100vh;
}
.card {
  margin: 100px 0;
}