Html 带有下拉菜单的完整css导航链接不起作用

我是Stackoverflow的新手，也是初级开发人员，请温柔一点…

我有一个完整的css导航的简单代码片段，我正在我的网站上测试它的响应性视图.它包括一个下拉子菜单，但这个链接不起作用，我不知道为什么.

以下是带有DropDown的汉堡菜单的代码:(Display:None更改为Display:Block"

Css:以下内容:

.mobile-menu {
    display: none;
}

.mobile-menu nav {
    float: right;
}

.mobile-menu a,div {
    text-decoration: none;
    color: #232323;
    transition: color 0.3s ease;
}

.mobile-menu a:hover {
    color: tomato;
 }

.mobile-menu #menuToggle {
    display: block;
    position: relative;
    top: 30px;
    right: 20px;
    width: 100%;
    z-index: 1;
    -webkit-user-select: none;
    user-select: none;
}

.mobile-menu #menuToggle input {
    display: block;
    width: 40px;
    height: 32px;
    position: absolute;
    top: -7px;
    left: -5px;
    cursor: pointer;
    opacity: 0; /* hide this */
    z-index: 2; /* and place it over the hamburger */
    -webkit-touch-callout: none;
}

.mobile-menu #menuToggle span {
    display: block;
    width: 33px;
    height: 4px;
    margin-bottom: 5px;
    position: relative;
    background: #fff;
    border-radius: 3px;
    z-index: 1;
    transform-origin: 4px 0px;
    transition: transform 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0),
    background 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0),
    opacity 0.55s ease;
}

.mobile-menu #menuToggle span:first-child {
    transform-origin: 0% 0%;
}

.mobile-menu #menuToggle span:nth-last-child(2) {
    transform-origin: 0% 100%;
}

.mobile-menu #menuToggle input:checked ~ span {
    opacity: 1;
    transform: rotate(45deg) translate(-2px, -1px);
    background: #232323;
}

.mobile-menu #menuToggle input:checked ~ span:nth-last-child(3) {
    opacity: 0;
    transform: rotate(0deg) scale(0.2, 0.2);
}

.mobile-menu #menuToggle input:checked ~ span:nth-last-child(2) {
    transform: rotate(-45deg) translate(0, -1px);
}

.mobile-menu #menu {
    position: absolute;
    width: 300px;
    margin: -100px 0 0 -50px;
    padding: 50px;
    padding-top: 125px;
    background: #ededed;
    list-style-type: none;
    -webkit-font-smoothing: antialiased;
    transform-origin: 0% 0%;
    transform: translate(110%, 0);
    right: -20px;
    transition: transform 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0);
}

.mobile-menu #menu li {
    padding: 10px 0;
    font-size: 22px;
    list-style-type: none;
}

.mobile-menu #menuToggle input:checked ~ ul {
    transform: none;
}

.onclick-menu:focus {
    pointer-events: none;
}

.onclick-menu:focus .onclick-menu-content {
    opacity: 1;
    visibility: visible;
    display: inherit;
    pointer-events: auto;
}

.onclick-menu-content {
   display: none;
    opacity: 0;
    visibility: hidden;
    transition: visibility 0.5s;
}
        
.onclick-menu-content li{
    list-style: none;
}

Html:

<div class="mobile-menu">

    <nav role="navigation">
    <div id="menuToggle">
        <input type="checkbox"/>

        <span></span>
        <span></span>
        <span></span>

        <ul id="menu">
            <li><a href="index.php">Start</a></li>
            <li class="">
                <div tabindex="0" class="onclick-menu">Über uns
                    <ul class="onclick-menu-content">
                        <li><a href="../ueber-uns.php#geschichte">Geschichte</a></li>
                        <li><a href="../ueber-uns.php#hackerhof">Der Betrieb heute</a></li>
                        <li><a href="../ueber-uns.php#philosophie">Philosophie</a></li>
                    </ul>
                </div>
            </li>
            <li class="">
                <div tabindex="0" class="onclick-menu">Direktvermarktung
                    <ul class="onclick-menu-content">
                        <li><a href="../direktvermarktung.php">Angebot</a></li>
                        <li><a href="../direktvermarktung.php#rindfleisch">Rindfleisch</a></li>
                        <li><a href="../direktvermarktung.php#gefluegel">Geflügel</a></li>
                        <li><a href="../direktvermarktung.php#freilandeier">Freilandeier</a></li>
                    </ul>
                </div>
            </li>
            <li class="">
                <div tabindex="0" class="onclick-menu">Aktuelles
                    <ul class="onclick-menu-content">
                        <li><a href="../aktuelles.php#info">News & Infos</a></li>
                        <li><a href="../aktuelles.php#verkauf">Verkaufszeiträume</a></li>
                        <li><a href="../aktuelles.php#faq">Fragen & Antworten</a></li>
                    </ul>
                </div>
            </li>
            <li><a href="kontakt.php">Kontakt</a></li>
        </ul>
    </div>
</nav>
</div>

我从CodePen那里得到的代码片段，下拉菜单中的链接也不起作用.

我确信我错过了一个非常明显的错误，如果有人向我指出这一点，我将不胜感激……

我已经try 插入其他链接或更改路径.到目前为止，没有任何东西起到帮助作用.

你可以在我的网站上测试一下:https://www.qualitaetaufbestellung.de/index.php

感谢您的支持！