React routing nothing shows up other than old background color

i am actually using V6 React Router Dom i made my index.js my routinng file :

import React from 'react';
import { BrowserRouter as Router, Routes, Route } from "react-router-dom";
import Login from './components/Login';
import Register from './components/Register';
import Welcome from './components/Welcome';
import TableauDetails from './components/TableauDetails';
import NotFound from './components/NotFound';

function App() {
    return (
        <Router>
            <Routes>
                <Route path="/" element={<Login />} />
                <Route path="/register" element={<Register />} />
                <Route path="/welcome" element={<Welcome />} />
                <Route path="/tableau/:id" element={<TableauDetails />} />
                <Route path="*" element={<NotFound />} />
            </Routes>
        </Router>
    );
}

export default App;

also whennever i try to access any other path i always get displayed that blue font background i used in one of my js

Rn i am only trynna access my / which should render my Login but it doesn work at all

import React, { useState } from 'react';
import '../Login.css';

const Login = () => {
    const [passwordVisible, setPasswordVisible] = useState(false);
    const [username, setUsername] = useState('');
    const [buttonText, setButtonText] = useState('Continue');

    const checkLoginPolicy = () => {
        const email = document.querySelector('input[name=username]');
        const span = document.querySelector('.username-value');
        span.innerHTML = email.value;

        setUsername(email.value);

        if (!email.value) {
            hidePasswordInput();
            setButtonText('Continue');
        } else if (email.value.includes('atlassian')) {
            hidePasswordInput();
            setButtonText('Log in with Atlassian');
        } else if (email.value.includes('acme') || email.value.includes('sso')) {
            hidePasswordInput();
            setButtonText('Log in with SSO');
        } else {
            setButtonText('Continue');
            return true;
        }

        return false;
    };

    const togglePassword = () => {
        setPasswordVisible(!passwordVisible);
    };

    const lockUsername = () => {
        const usernameInput = document.querySelector('input[name=username]');
        const usernameDiv = document.querySelector('.read-only-username');
        usernameInput.classList.add('hidden');
        usernameDiv.classList.remove('hidden');
        showPasswordInput();
    };

    const editUsername = () => {
        const usernameInput = document.querySelector('input[name=username]');
        const usernameDiv = document.querySelector('.read-only-username');
        const password = document.querySelector('input[name=password]');
        usernameInput.classList.remove('hidden');
        usernameDiv.classList.add('hidden');
        password.value = '';
        setButtonText('Continue');
        hidePasswordInput();
    };

    const hidePasswordInput = () => {
        const pswdSection = document.querySelector('#pswd');
        pswdSection.classList.add('hidden');
        setPasswordVisible(false);
    };

    const showPasswordInput = () => {
        const pswdSection = document.querySelector('#pswd');
        pswdSection.classList.remove('hidden');
        setPasswordVisible(true);
    };

    const updateButton = (text) => {
        setButtonText(text || 'Continue');
    };

    const onSubmit = (e) => {
        e.preventDefault();
        e.stopPropagation();

        const shouldShowPasswordInput = checkLoginPolicy();

        if (shouldShowPasswordInput) {
            lockUsername();
            showPasswordInput();
            updateButton('Log in');
        }
    };

    return (
        <>
            <header>
                <img src="https://d2k1ftgv7pobq7.cloudfront.net/meta/c/p/res/images/trello-header-logos/76ceb1faa939ede03abacb6efacdde16/trello-logo-blue.svg" />
            </header>
            <main>
                <form onSubmit={onSubmit}>
                    <h3>Log in to Trello</h3>
                    <section>
                        <label htmlFor="username">Email Address</label>
                        <input
                            type="email"
                            name="username"
                            placeholder="Email Address"
                            autoComplete="username"
                            required
                            value={username}
                            onChange={(e) => setUsername(e.target.value)}
                        />
                        <div className="read-only-username hidden">
                            <span className="username-value"></span>
                            <a className="edit-username" onClick={editUsername}>
                                <i>
                                    <svg
                                        width="24"
                                        height="24"
                                        viewBox="0 0 24 24"
                                        focusable="false"
                                        role="presentation"
                                    >
                                        <path
                                            d="M4.02 19.23a1 1 0 0 0 1.18 1.18l3.81-.78-4.21-4.21-.78 3.81zM19.844 6.707l-2.12-2.122A1.997 1.997 0 0 0 16.308 4c-.512 0-1.024.195-1.415.585l-9.757 9.758 4.95 4.95 9.757-9.758a2 2 0 0 0 0-2.828z"
                                            fill="currentColor"
                                            fillRule="evenodd"
                                        ></path>
                                    </svg>
                                </i>
                            </a>
                        </div>
                    </section>
                    <section className={passwordVisible ? '' : 'hidden'} id="pswd">
                        <label htmlFor="password">Password</label>
                        <input
                            type={passwordVisible ? 'text' : 'password'}
                            name="password"
                            placeholder="Password"
                            autoComplete="current-password"
                        />
                        <a className="toggle-password" onClick={togglePassword}>
                            <i className={passwordVisible ? 'eye open' : 'eye closed'}>
                                <svg
                                    width="24"
                                    height="24"
                                    viewBox="0 0 24 24"
                                    focusable="false"
                                    role="presentation"
                                >
                                    <g fill="currentColor" fillRule="evenodd">
                                        <path
                                            d="M12 18c-4.536 0-7.999-4.26-7.999-6 0-2.001 3.459-6 8-6 4.376 0 7.998 3.973 7.998 6 0 1.74-3.462 6-7.998 6m0-14C6.48 4 2 8.841 2 12c0 3.086 4.576 8 10 8 5.423 0 10-4.914 10-8 0-3.16-4.481-8-10-8"
                                        ></path>
                                        <path
                                            d="M11.977 13.984c-1.103 0-2-.897-2-2s.897-2 2-2c1.104 0 2 .897 2 2s-.896 2-2 2m0-6c-2.206 0-4 1.794-4 4s1.794 4 4 4c2.207 0 4-1.794 4-4s-1.793-4-4-4"
                                        ></path>
                                    </g>
                                </svg>
                            </i>
                        </a>
                    </section>
                    <button>{buttonText}</button>
                </form>
                <hr />
                <div className="bottom-links">
                    <a className="forgotLink" href="#">
                        Can't log in?
                    </a>
                    &#x2022;
                    <a className="signupLink" href="#">
                        Sign up for an account
                    </a>
                </div>
            </main>
            <div className="background"></div>
        </>
    );
};

export default Login;

thank you for ur time and advice

i tried to switch versions of the router while also switching the syntax but nothing works tried installing other versions of node but nothing