我正在尝试改变导航栏的背景颜色时滚动到底部。我正在尝试添加类，但它不能覆盖bootstrap！重要属性。我的代码是:

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let navbar = document.querySelector('.navbar');
let section = document.querySelectorAll('section');

section.addEventListener('mouseover', addIt);

function addIt() {
    navbar.classList.remove('bg-transparent');
    navbar.classList.add('bg-dark');
}

nav.bg-dark {
    background-color: #e8e4e1 !important;
}

<nav class="navbar navbar-expand-lg navbar-light bg-transparent fixed-top">
            <div class="container-fluid">
                <a class="navbar-brand" href="#"><img src="./img/logo-min.png" alt="JN-Fashion-Zone"></a>
                <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
                <div class="collapse navbar-collapse" id="navbarNav">
                    <ul class="navbar-nav">
                        <li class="nav-item home">
                            <a class="nav-link" aria-current="page" href="#">Home</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link" href="#">Products</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link" href="#">Services</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link" href="#">Contacts</a>
                        </li>
                    </ul>
                </div>
            </div>
        </nav>

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