body { font-family: sans-serif; background: #f2f2f2; }
.container { max-width: 700px; margin: 40px auto; background: white; padding: 20px; border-radius: 10px; }
.container.small { max-width: 400px; margin-top: 100px; }
.card { background: #fafafa; padding: 15px; border-radius: 8px; margin: 20px 0; }
button { padding: 10px 18px; margin: 5px; border: none; background: #007bff; color:white; border-radius:5px; cursor:pointer; }
.error { color:red; }