body {
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: #fff;
  text-align: center;
}

#round {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  font-family: sans-serif;
}

#display {
  width: 100%;
  font-size: clamp(5rem, 20vw, 25rem);
  font-weight: bold;
  font-family: sans-serif;
  white-space: nowrap;
}

/* hide the real input but keep it focusable */
#hidden-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  border: none;
  padding: 0;
  margin: 0;
}