body {
  max-width: 500px;
  margin: 0 auto;
  padding: 10px;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

header img {
  width: 75px;
}

#home {
  text-align: center;
}

#home, #encrypt, #decrypt {
  display: none;
}

.decrypting {
  display: none;
}

.decrypted-text, .encrypted-text {
  display: none;
}