body {
  background-color: black;
  text-align: center;
  animation: backgroundFade 50s infinite alternate;
}

h1 {
  color: white;
  margin-top: 0;
  padding-top: 40px;
  font-size: 400%;
}

h2 {
  color: white;
  font-size: 30px;
}

.input-container {
  padding: 20px;
  color: white;
  font-size: 20px;
}

.input-field {
  padding: 10px;
  font-size: 18px;
  width: 80%;
  margin-top: 10px;
  border-radius: 5px;
  border: none;
}

.btn {
  height: 90px;
  width: 90px;
  margin: 40px;
  background-color: turquoise;
  animation: stretch 1.5s infinite;
  border-radius: 50%;
  border: none;
  color: black;
  font-weight: bold;
  cursor: pointer;
}

.btn:hover {
  background-color: violet;
}

@keyframes stretch {
  0% {
    transform: scale(0.3);
    background-color: turquoise;
  }
  50% {
    background-color: violet;
  }
  100% {
    transform: scale(1.5);
    background-color: peachpuff;
  }
}

@keyframes backgroundFade {
  from { background-color: black; }
  to { background-color: #222; }
}