   <link href="carousel.css" rel="stylesheet">
  </head>
  <body>

    <header>
      <nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark">
        <a class="navbar-brand" href="#">Carousel</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collaps