Preview:
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Bootstrap Example</title>
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>

<!-- Navigation Bar -->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
    <a class="navbar-brand" href="#">My Website</a>
    <div class="collapse navbar-collapse">
        <ul class="navbar-nav">
            <li class="nav-item active"><a class="nav-link" href="#">Home</a></li>
            <li class="nav-item"><a class="nav-link" href="#" data-toggle="modal" data-target="#myModal">Open Modal</a></li>
            <li class="nav-item"><a class="nav-link" href="#cards">Cards</a></li>
        </ul>
    </div>
</nav>

<!-- Main Content -->
<div class="container mt-5">
    <h1>Welcome to My Bootstrap Website!</h1>

    <div id="cards" class="row mt-3">
        <div class="col-md-4">
            <div class="card mb-4"><img src="https://via.placeholder.com/350" class="card-img-top" alt="Card image">
                <div class="card-body">
                    <h5 class="card-title">Card 1</h5>
                    <p class="card-text">Description for Card 1.</p>
                </div>
            </div>
        </div>
        <div class="col-md-4">
            <div class="card mb-4"><img src="https://via.placeholder.com/350" class="card-img-top" alt="Card image">
                <div class="card-body">
                    <h5 class="card-title">Card 2</h5>
                    <p class="card-text">Description for Card 2.</p>
                </div>
            </div>
        </div>
        <div class="col-md-4">
            <div class="card mb-4"><img src="https://via.placeholder.com/350" class="card-img-top" alt="Card image">
                <div class="card-body">
                    <h5 class="card-title">Card 3</h5>
                    <p class="card-text">Description for Card 3.</p>
                </div>
            </div>
        </div>
    </div>
</div>

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog">
    <div class="modal-dialog" role="document">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title">Modal title</h5>
                <button type="button" class="close" data-dismiss="modal">&times;</button>
            </div>
            <div class="modal-body"><p>This is a simple modal example.</p></div>
            <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
            </div>
        </div>
    </div>
</div>

<!-- Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.3/dist/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>

</body>
</html>
downloadDownload PNG downloadDownload JPEG downloadDownload SVG

Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter