body {
  font-family: sans-serif;
  display: flex;
  height: 100vh;
  margin: 0;
  background: #f2f2f2;
  align-items: center;
  justify-content: center;
}

.app {
  text-align: center;
  background: white;
  padding: 2em;
  border-radius: 1em;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

#count {
  font-size: 4em;
  margin: 0.5em 0;
}

button {
  font-size: 2em;
  margin: 0.2em;
  padding: 0.3em 0.6em;
}