CSS not being applied

Hello, I’m building a portfolio site using vite. My entry point is index.js, when I npm run dev i.e, when I start the server css is working fine, but when I open the site using live server css is not working. index.html is in the root. PS. I’m just a beginner, sorry if I might have sound dumb.

index.html
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>L's Portfolio</title>

  <!-- Favicon -->
  <link rel="icon" href="/photos/L.jpg" />

  <!-- Bootstrap css -->
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet"
    integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous" />

  <!-- Bootstrap icons -->
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css" />

  <!-- Custom css -->
  <link rel="stylesheet" href="/css/styles.css" />

  <!-- Fonts -->
  <link rel="preconnect" href="https://fonts.googleapis.com" />
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
  <link
    href="https://fonts.googleapis.com/css2?family=Darker+Grotesque:wght@300..900&family=Gemunu+Libre:wght@200..800&family=Montserrat:ital,wght@0,100..900;1,100..900&display=swap"
    rel="stylesheet" />
  <link rel="preconnect" href="https://fonts.googleapis.com">
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
  <link
    href="https://fonts.googleapis.com/css2?family=Darker+Grotesque:wght@300..900&family=Gemunu+Libre:wght@200..800&family=Miltonian+Tattoo&family=Montserrat:ital,wght@0,100..900;1,100..900&display=swap"
    rel="stylesheet">

</head>

<body id="home" class="dark">
  <!-- header -->
  <header>
    <nav class="navbar  navbar-expand-lg text-white">
      <div class="container-fluid">
        <!-- Logo -->
        <span><a class="nav-link logo" href="#">L.</a></span>

        <!-- Navbar Toggle -->

        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent"
          aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>

        <!-- Menu -->
        <div class="collapse navbar-collapse" id="navbarSupportedContent" ;>
          <!-- Menu list -->
          <ul class="navbar-nav navbar-menu d-flex my-1 justify-content-center align-items-center w-100 list-unstyled"
            ;>
            <li class="nav-item ">
              <a class="nav-link active" aria-current="page" href="#home">Home</a>
            </li>

            <li class="nav-item">
              <a class="nav-link active " aria-current="page" href="#about">About</a>
            </li>

            <li class="nav-item">
              <a class="nav-link active " aria-current="page" href="#skills-section">Skills</a>
            </li>

            <li class="nav-item">
              <a class="nav-link active " aria-current="page" href="#projects">Projects</a>
            </li>

            <li class="nav-item">
              <a class="nav-link active" aria-current="page" href="#contact">Contact</a>
            </li>

            <!-- Toggle swicth for -->
            <li>
              <div class="form-check form-switch theme">
                <input class="form-check-input theme-toggle-inp" type="checkbox" checked="checked" role="switch"
                  id="flexSwitchCheckDefault" />
                <label class="form-check-label theme-toggle" for="flexSwitchCheckDefault"><i class="bi bi-sun-fill sun"
                    ;></i>
                  <i class="bi bi-moon-stars-fill moon" ;></i>

                </label>
              </div>
            </li>
          </ul>
        </div>
      </div>
    </nav>
  </header>
  <!-- End of header -->

  <!-- Main content -->
  <main class="main-content container-fluid">
    <div class="smooth-content">
      <!-- Start of Hero section -->
      <section class="hero-section my-5" id="about">
        <div class="hero">
          <figure class="hero-section-figure">
            <img class="hero-img img-fluid heroimg" src="/photos/her.png" />
            
          </figure>

          <article class="about-me">
            <h3 class="about-me-header">About me</h3>
            <div class="about-me-para">
              <p>
                I am a creative and detail-oriented web developer with a passion
                for crafting engaging and user-friendly websites. My expertise
                lies in HTML, CSS, JavaScript. I enjoy the process of
                translating design concepts into functional and responsive
                websites.
              </p>
              <p>
                As a web developer, I am dedicated to continuous learning and
                growth, always seeking to expand my knowledge and refine my
                craft. I am excited about the possibilities of web development
                and the opportunity to create impactful digital experiences that
                resonate with users.
              </p>
              <div class="d-flex justify-content-center">
                <button class="btn hero-btn">
                  <a href="#contact">Get in touch.</a>
                </button>
              </div>
              <!-- <svg style="height:90px"; class="plane" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="#f3f3f1" d="M16.1 260.2c-22.6 12.9-20.5 47.3 3.6 57.3L160 376l0 103.3c0 18.1 14.6 32.7 32.7 32.7c9.7 0 18.9-4.3 25.1-11.8l62-74.3 123.9 51.6c18.9 7.9 40.8-4.5 43.9-24.7l64-416c1.9-12.1-3.4-24.3-13.5-31.2s-23.3-7.5-34-1.4l-448 256zm52.1 25.5L409.7 90.6 190.1 336l1.2 1L68.2 285.7zM403.3 425.4L236.7 355.9 450.8 116.6 403.3 425.4z"/></svg> -->
            </div>
          </article>
        </div>
      </section>
      <!-- End of Hero section -->

      <!-- Skills Section -->
      <section id="skills-section">
        <div class="skill">
          <div class="skill-div">
            <h3 class="mx-3">My Skills</h3>
            <p class="mx-3">What my skills include?</p>
            <p class="skill-para container-fluid">
              I am a passionate web developer committed to delivering
              high-quality websites that not only meet technical requirements
              but also delight users with intuitive design and seamless
              functionality.
            </p>

            <div class="form-check form-switch s">
              <input class="form-check-input skills-tools-toggle" type="checkbox" role="switch"
                id="flexSwitchCheckChecked" unchecked />
              <label class="form-check-label skills-tools" for="flexSwitchCheckChecked"></label>
            </div>
          </div>

          <figure class="skills-fig" id="skills-img">
            <!-- Skills -->
            <img src="/photos/html.png" style="height: 70px" class="p-2 skills html tooltip-bg" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="HTML" />

            <img src="/photos/css.png" style="height: 70px" class="p-2 skills" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="CSS" />

            <img src="/photos/js.png" style="height: 90px" class="p-2 skills" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="JS" />
            <img src="/photos/bootstrap.png" style="height: 70px" class="p-2 skills" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="Bootsrap" />
            <img src="/photos/tailwind.png" style="height: 50px" class="p-2 skills" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="tailwind" />
            <img src="/photos/express.png" style="height: 60px" class="p-2 skills" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="expressJS" />
            <img src="/photos/mysql.png" style="height: 70px" class="p-2 skills" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="MySQL" />

            <!-- Tools -->
            <img src="/photos/gitbash.png" style="height: 70px" class="p-2 tools hidden" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="Git Bash" />
            <img src="/photos/github.png" style="height: 70px" class="p-2 tools hidden" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="Github" />

            <img src="/photos/npm.png" style="height: 70px" class="p-2 tools hidden" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="npm" />

            <img src="/photos/postman.png" style="height: 70px" class="p-2 tools hidden" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="postman" />

            <img src="/photos/nodejs.png" style="height: 70px" class="p-2 tools hidden" data-bs-toggle="tooltip"
              data-bs-placement="bottom" title="nodeJS" />

          </figure>
        </div>
      </section>
      <!-- End of skills section -->

      <!-- Projects section -->
      <section id="projects">
        <h3 class="text-center mb-5">My Projects</h3>

        <div class="d-flex flex-column justify-content-center align-items-center">
          <div class="card text-center my-5">
            <img src="/photos/project1.png" class="card-img-top" alt="project1" />
            <div class="card-body">
              <h5>FullStack-Wanderlust</h5>
              <p class="card-text hide-p">
                A small clone of Airbnb, using HTML, CSS, Javascript, Bootstrap, MongoDB, Node.js & Express.js.
              </p>
              <a href="https://delta-project-vz4s.onrender.com/listings" class="btn">Checkout!</a>
            </div>
          </div>

          <div class="card text-center my-5">
            <img src="/photos/project2.png" class="card-img-top" alt="project2" />
            <div class="card-body">
              <h5>Frontend- Spotify</h5>
              <p class="card-text hide-p">Spotify homepage clone using HTML, CSS.</p>
              <a href="https://delta-project-vz4s.onrender.com/listings" class="btn">Checkout!</a>
            </div>
          </div>
        </div>
      </section>
      <!-- End of projects section -->


      <!-- Contact section -->
      <section id="contact">
        <h3 class="contact-me">Contact me</h3>
        <!-- Contact list -->
        <div class="contact-me-content">
          <ul class="contact-list">
            <div>
              <li>
                <i class="bi bi-geo-alt-fill"></i>
                Address:
              </li>
              <p>789 XXXXXXX, XXXXXXX, XX 2222, XXXXXXXXXX</p>
            </div>

            <div>
              <li>
                <i class="bi bi-telephone-fill"></i>
                Phone:
              </li>
              <p>+9X-XXXXXXXXXX</p>
            </div>

            <div>
              <li>
                <i class="bi bi-envelope-fill"></i>
                E-mail:
              </li>
              <p>LLLLLLLL@gmail.com</p>
            </div>
          </ul>
          <div>
            <div>
              <form class="contact-form" method="POST" action="/sendmail">

                <div class="row mb-3 d-flex flex-column">
                  <label for="name" class="col-sm col-form-label">Name</label>
                  <div class="col-sm-10">
                    <input name="name" value="name" type="text" class="form-control" id="name">
                  </div>
                </div>

                <div class="row mb-3 d-flex flex-column">
                  <label for="email" class="col-sm col-form-label">Email</label>
                  <div class="col-sm-10">
                    <input name="email" value="email" type="email" class="form-control" id="email">
                  </div>
                </div>

                <div class="row mb-3">
                  <label for="message" class=" col-sm colform-label">Message</label>
                  <div class="col-sm-10">
                    <textarea class="form-control" id="message" value="message" rows="3" name="message"></textarea>
                  </div>
                </div>


                <button type="submit" value="send" class="btn btn-primary sendmail">Send Mail</button>
              </form>

            </div>
          </div>

      </section>
      <!-- End of contact section -->

      <!-- footer -->
      <footer id="footer">
        <p>&copy; L. All Rights Reserved.</p>
      </footer>
      <!-- End of footer -->
    </div>

    
  </main>
  <!-- End of main -->

  <!--Bootstrap JS-->
  <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.11.8/dist/umd/popper.min.js"
    integrity="sha384-I7E8VVD/ismYTF4hNIPjVp/Zjvgyol6VFvRkX/vR+Vc4jQkC+hVqc2pM8ODewa9r"
    crossorigin="anonymous"></script>

  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.min.js"
    integrity="sha384-0pUGZvbkm6XF6gxjEnlmuGrJXVbNuzT9qBBavbLwCsOGabYfZo0T0to5eqruptLy"
    crossorigin="anonymous"></script>

  <!-- Custom JS -->
  <script type="module" src="/js/script.js"></script>
  <script type="module" src="/app.js"></script>


</body>`Preformatted text`

</html>
    

index.js
const express = require('express');
const path = require('path');
const nodemailer = require('nodemailer');
const bodyparser = require('body-parser');
const app = express();
const port = 3000;

app.use(express.urlencoded({ extended: true }));
app.use(bodyparser.urlencoded({ extended: true }));
app.use(express.json());
app.use(express.static(path.join(__dirname, '/index.html')));
app.use(express.static(path.join(__dirname, '/public')));




app.get('/', (req, res) => {    
    res.sendFile(path.join(__dirname, '/index.html'));
});
app.get('/sendmail', (req, res) => {
    res.sendFile(path.join(__dirname, '/index.html'));
});

app.post('/sendmail',(req,res)=>{
    let {name, email, message} = req.body;
    console.log(name, email, message);

    const transporter = nodemailer.createTransport({
        host: process.env.MAIL_HOST,
        port: process.env.MAIL_PORT,
        auth: {
            user: process.env.MAIL_USER,
            pass: process.env.MAIL_PASS
        }
    });

    const mailOptions = {
        from: email,
        to: 'sasasa6697@gmail.com',
        text: message
    };
    transporter.sendMail(mailOptions, (error, info)=>{
if(error){
    console.log("error");
} else {
    console.log("Email sentt!," , info.response);
}
res.redirect('/');
    })
   
    })



app.listen(port,()=>{
    console.log(`Listentining on port ${port}`);
})
package.json
{
  "name": "vite-project",
  "private": true,
  "version": "0.0.0",
  "type": "module",
  "scripts": {
    "dev": "vite",
    "build": "vite build",
    "preview": "vite preview"
  
  },
  "devDependencies": {
    "vite": "^5.3.4"
  },
  "dependencies": {
    "body-parser": "^1.20.2",
    "dotenv": "^16.4.5",
    "express": "^4.19.2",
    "gsap": "^3.12.5",
    "gsap-trial": "^3.12.5",
    "nodemailer": "^6.9.14",
    "path": "^0.12.7"
  }
}

Do you mean this styles.css is not being applied?
Where did you put this file relative to index.html?