我试着让我的下拉菜单和导航条有相同的不透明度和模糊效果，不透明度工作正常，但模糊效果不。
我听说我必须使用伪类来实现这一点，但我不确定是否实现。
.navbar {
background-color: rgba(255, 255, 255, 0.8) !important;
backdrop-filter: blur(3px);
}
.dropdown-menu {
background-color: rgba(255, 255, 255, 0.8) !important;
backdrop-filter: blur(3px);
}<link
href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css"
rel="stylesheet"
integrity="sha384-KK94CHFLLe+nY2dmCWGMq91rCGa5gtU4mk92HdvYe+M/SXH301p5ILy+dN9+nJOZ"
crossorigin="anonymous"
/>
<script
src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"
integrity="sha384-ENjdO4Dr2bkBIFxQpeoTz1HIcje39Wm4jDKdf19U8gI4ddQ3GYNS7NTKfAdVQSZe"
crossorigin="anonymous"
></script>
</head>
<body>
<nav class="navbar navbar-expand-lg fixed-top" style="">
<div class="container">
<a class="navbar-brand" href="#">Navbar</a>
<button
class="navbar-toggler"
type="button"
data-bs-toggle="collapse"
data-bs-target="#navbarNavDropdown"
aria-controls="navbarNavDropdown"
aria-expanded="false"
aria-label="Toggle navigation"
>
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavDropdown">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="#">Home</a>
</li>
<li class="nav-item dropdown">
<a
class="nav-link dropdown-toggle"
href="#"
role="button"
data-bs-toggle="dropdown"
aria-expanded="false"
>
Dropdown link
</a>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
</ul>
</li>
</ul>
</div>
</div>
</nav>
<h1>Example Text</h1>
<h1>Example Text</h1>
<h1>Example Text</h1>
<h1>Example Text</h1>
<h1>Example Text</h1>
</body>可以看到，下拉框没有模糊效果，尽管我已经使用了!important;
我想你是想得到下面这个结果。
.navbar {
background-color: rgba(255, 255, 255, 0.8) !important;
backdrop-filter: blur(3px);
}
.dropdown-menu {
background-color: rgba(255, 255, 255, 0.2) !important;
backdrop-filter: blur(0);
}<link
href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css"
rel="stylesheet"
integrity="sha384-KK94CHFLLe+nY2dmCWGMq91rCGa5gtU4mk92HdvYe+M/SXH301p5ILy+dN9+nJOZ"
crossorigin="anonymous"
/>
<script
src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"
integrity="sha384-ENjdO4Dr2bkBIFxQpeoTz1HIcje39Wm4jDKdf19U8gI4ddQ3GYNS7NTKfAdVQSZe"
crossorigin="anonymous"
></script>
</head>
<body>
<nav class="navbar navbar-expand-lg fixed-top" style="">
<div class="container">
<a class="navbar-brand" href="#">Navbar</a>
<button
class="navbar-toggler"
type="button"
data-bs-toggle="collapse"
data-bs-target="#navbarNavDropdown"
aria-controls="navbarNavDropdown"
aria-expanded="false"
aria-label="Toggle navigation"
>
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavDropdown">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="#">Home</a>
</li>
<li class="nav-item dropdown">
<a
class="nav-link dropdown-toggle"
href="#"
role="button"
data-bs-toggle="dropdown"
aria-expanded="false"
>
Dropdown link
</a>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
</ul>
</li>
</ul>
</div>
</div>
</nav>
<h1>Example Text</h1>
<h1>Example Text</h1>
<h1>Example Text</h1>
<h1>Example Text</h1>
<h1>Example Text</h1>
</body>