Untitled

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

    <title>Hello, world!</title>
  </head>
  <body>
    <header>
  <!-- Navbar -->
  <nav class="navbar navbar-expand-lg navbar-light bg-white fixed-top">
    <div class="container-fluid">
      <button
        class="navbar-toggler"
        type="button"
        data-mdb-toggle="collapse"
        data-mdb-target="#navbarExample01"
        aria-controls="navbarExample01"
        aria-expanded="false"
        aria-label="Toggle navigation"
      >
        <i class="fas fa-bars"></i>
      </button>
      <div class="collapse navbar-collapse" id="navbarExample01">
        <ul class="navbar-nav me-auto mb-2 mb-lg-0">
          <li class="nav-item active">
            <a class="nav-link" aria-current="page" href="#">Home</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Features</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Pricing</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">About</a>
          </li>
        </ul>
      </div>
    </div>
  </nav>
  <!-- Navbar -->

  <!-- Background image -->
  <div
    class="p-5 text-center bg-image"
    style="
      background-image: url('https://mdbcdn.b-cdn.net/img/new/slides/041.jpg');
      height: 400px;
      margin-top: 58px;
    "
  >
    <div class="mask" style="background-color: rgba(0, 0, 0, 0.6);">
      <div class="d-flex justify-content-center align-items-center h-100">
        <div class="text-white">
          <h1 class="mb-3">Heading</h1>
          <h4 class="mb-3">Subheading</h4>
          <a class="btn btn-outline-light btn-lg" href="#!" role="button"
            >Call to action</a
          >
        </div>
      </div>
    </div>
  </div>
  <!-- Background image -->
</header>

    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
  </body>
</html>