simulation/index3.html at master · zl-liu/simulation · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" type="text/css" href="css/style2.css">
</head>
<body>

<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-light bg-light static-top mb-5 shadow">
    <div class="container">
        <a class="navbar-brand" href="#">Start Bootstrap</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarResponsive">
            <ul class="navbar-nav ml-auto">
                <li class="nav-item active">
                    <a class="nav-link" href="#">Home
                        <span class="sr-only">(current)</span>
                    </a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">About</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Services</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Contact</a>
                </li>
            </ul>
        </div>
    </div>
</nav>

<!-- Page Content -->
<div class="container">
    <div class="card border-0 shadow my-5">
        <div class="card-body p-5">
            <h1 class="font-weight-light">Fixed Full Page Background Image</h1>
            <p class="lead">In this snippet, the background image is fixed to the body element. Content on the page will scroll, but the image will remain in a fixed position!</p>
            <p class="lead">Scroll down...</p>
            <div style="height: 700px"></div>
            <p class="lead mb-0">You've reached the end!</p>
        </div>
    </div>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" integrity="sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.bundle.min.js"></script>
</body>
</html>