body {
  font-family: 'IBM Plex Mono', monospace;
}

#converter {
  max-width: 500px;
  border: 10px solid pink;
  border-radius: 10px;
  margin: 4rem auto 0 auto;
  padding: 2rem;
  text-align: center;
}

h1 {
  margin: 0 0 2rem 0;
  font-size: 1.6rem;
}
form h1 {
  font-size: 3rem;
  margin: 0 0 1rem 0;
}

label {
  text-transform: uppercase;
  letter-spacing: 1px;
}

input {
  border: none;
  border: 2px solid black;
  display: block;
  width: 70%;
  height: 2rem;
  text-align: center;
  margin: 0.5rem auto 1rem auto;
}

input:focus {
  background-color: pink;
  border: 2px solid black;
  outline: none;
  color: black;
  font-weight: bold;
}

.hidden {
  display: none;
}

button {
  display: block;
  margin: 2.5rem auto 0 auto;
  padding: 0.6rem;
  background-color: pink;
  border-bottom: 2px solid black;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}