body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #fafafa; }
.container { max-width: 800px; margin: auto; padding: 20px; text-align: center; }
ul { list-style: none; padding: 0; }
li { background: #fff; margin: 10px 0; padding: 15px; border: 1px solid #ddd; border-radius: 5px; }
button { background: #000; color: #fff; padding: 10px 20px; border: none; cursor: pointer; margin-top: 20px; }