body { font-family: sans-serif; background-color: #f4f4f9; display: flex; justify-content: center; padding: 20px; }
.container { background: white; padding: 2rem; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); width: 100%; max-width: 500px; }
.input-group { margin-bottom: 15px; display: flex; flex-direction: column; }
input { padding: 10px; border: 1px solid #ddd; border-radius: 4px; margin-top: 5px; }
button { width: 100%; padding: 10px