.container-fluid {
  align-items: center;
  display: flex;
  flex-direction: column;
}

form {
  align-items: center;
  display: flex;
  flex-direction: column;
  max-width: 500px;
}

img {
  width: 128px;
}

.num-characters {
  width: 300px;
}

.output {
  width: 600px;
}