html {
  font-family: sans-serif;
}

h2 {
  font-weight: normal;
}
section + section {
  margin-top: 2em;
}

form {
  display: grid;
  grid-gap: 1em;
  justify-content: center;
  align-items: center;
}

form label {
  grid-column: 1;
  text-align: right;
  font-weight: bold;
}
form input {
  grid-column: 2;
  text-align: center;
  padding: 0.5em;
  font-size: 1em;
}

#result {
  text-align: center;
  padding: 1em;
  font-size: 2em;
}