引导粘性顶部导航条在滚动条上消失

导航栏一直贴在顶部,直到我从英雄图像中滚动出来,然后消失。我希望导航栏贯穿整个页面。有什么想法吗?

<nav class="navbar sticky-top navbar-expand-lg navbar-dark bg-dark">
        <div class="collapse navbar-collapse">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item active">
                    <a class="nav-link" href="#home">Home</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#about">About Me</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#projects">Projects</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#contact">Contact Me</a>
                </li>
            </ul>
        </div>
    </nav>
<!--Navbar end-->

<!-- Homescreen hero -->
    <div class="hero-image" id="home">
        <div class="hero-text">
            <h1 class="name">Text</h1>
            <h1>Text</h1>
        </div>
    </div>