body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f2f2f2;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app {
  flex: 1;
  max-width: 420px;
  margin: 0 auto;
  padding: 16px;
}

h1, h2 {
  text-align: center;
}

button {
  width: 100%;
  padding: 16px;
  margin-bottom: 12px;
  font-size: 16px;
  border: none;
  border-radius: 10px;
  background: #2b7cff;
  color: white;
}

.footer {
  text-align: center;
  font-size: 12px;
  color: #777;
  padding: 10px 0;
}