body {
  font-family: Arial, sans-serif;
  background: #181c24;
  color: #fff;
  margin: 0;
  padding: 0;
}
#app {
  max-width: 400px;
  margin: 40px auto;
  background: #23283a;
  border-radius: 12px;
  box-shadow: 0 4px 24px #000a;
  padding: 32px 24px;
}
button {
  background: #ff4b5c;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 12px 24px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 16px;
}
input, select {
  padding: 8px;
  border-radius: 4px;
  border: none;
  margin-top: 8px;
  font-size: 1rem;
}