* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  font-size: 5rem;
  display: grid;
  place-content: center;
}

input,
button {
  font: inherit;
  padding: 0.5rem;
}

section {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

input {
  text-align: center;
  max-width: 2.5em;
}

button {
  font-size: 2rem;
  margin: 0.5em 0 0.5em 0.5em;
  min-width: 2em;
}

button:first-child {
  margin-left: 0;
}
