body { font-family: sans-serif; background: #f0f0f0; }
.login-container {
  max-width: 400px; margin: 100px auto; background: #fff;
  padding: 20px; box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
input, button {
  width: 100%; padding: 10px; margin: 5px 0;
}