html, body {
  background-color: black;
}

span {
  font-family: monospace;
}

.container2 {
  display: flex;
}
.container2 div {
  width: 50vw;
}

.container3 {
  display: flex;
}

.container3 div {
  width: 25vw;
}

.encrypt {
  background-color: black;
  color: white;
  font-family: monospace;
  font-size: 2em;
}

.decrypt {
  background-color: white;
  color: black;
  font-size: 2em;
}

.decrypted {
  background-color: black;
  color: white;
  font-size: 2em;
}

.highlight {
  color: red;
  font-size: 2em;
}