React Js Checkbox readonly

<!DOCTYPE html>
<html>

function App() {
            const [checked, setChecked] = useState(true);

return (
                <div className="container">
                    <h3>React Js Checkbox readonly</h3>
                    <div className={`checkbox${checked ? ' checked' : ''}`}>
                        <input type="checkbox" checked={checked} readOnly />
                        <span className="checkbox-label">Read-only Checkbox</span>
                    </div>
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>

.container {
            margin: 0 auto;
            width: 600px;
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }

h3 {
            margin-bottom: 20px;
            color: #333;
        }

label {
            display: flex;
            align-items: center;
            cursor: pointer;
            font-size: 18px;
            color: #666;
        }

input[type="checkbox"] {
            margin-right: 10px;
            appearance: none;
            width: 20px;
            height: 20px;
            border: 2px solid #999;
            border-radius: 4px;
            outline: none;
            transition: border-color 0.3s ease-in-out;
        }

input[type="checkbox"]:checked {
            border-color: #55a630;
            background-color: #55a630;
        }

input[type="checkbox"]:checked::before {
            content: "";
            display: block;
            width: 10px;
            height: 10px;
            margin: 4px;
            background-color: #fff;
            border-radius: 2px;
        }

input[type="checkbox"]:disabled {
            cursor: not-allowed;
            opacity: 0.6;
        }

input[type="checkbox"]:disabled+span {
            color: #999;
        }
    </style>
</body>

</html>