首先快速感谢所有曾帮助我的人：）
我现在遇到的问题是我的导航栏，当它转到平板电脑尺寸时，它似乎将li转换到左侧，这也发生在我的子菜单中。
我的第二个问题是，我的子菜单不适用于移动尺寸，移动尺寸导航菜单不显示子菜单。
当我点击子菜单时，似乎很难解释li子菜单颜色的转换，但你可以在完整的媒体尺寸上看到它。
提前谢谢你。
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答案 0 :(得分：0)
首先，如果要将其设置为“padding：10px;”，则可以使用悬停上的填充。然后它不会把所有东西推到左边。
其次，如果添加“z-index：100;” （nav .nav li ul）将对您的问题进行排序。
z-index基本上是页面上的图层，因此通过将其设置为100，它将位于悬停上方的内容上。
我知道答案不好......我的第一个答案也是！
希望这有帮助！
答案 1 :(得分：0)
您的链接在悬停时向左移动的原因是您已设置此媒体查询：
/*TABLET*/
@media (max-width: 780px){
/*Navigation a*/
nav .nav li a{
padding:10px;
}
但是，您尚未为:hover设置padding: 10px;，因此它会从之前的设置样式中获取padding: 20px;，因此会为您的链接添加额外的10px填充并移动它们。
将此添加到您的媒体查询中：
nav .nav li a:hover {
padding:10px;
}
对于您的第二个问题，当您的菜单缩小时，您的子菜单链接会显示在主菜单链接下方，而不是鼠标悬停在子菜单上，而是将鼠标悬停在下方堆叠的主链接上。添加position: relative和z-index来解决此问题：
/*Make submenu vertical*/
nav .nav li ul li{
width:100%;
display: block;
float:none;
line-height:60px;
position: relative; /*add this to make z-index work*/
z-index: 10; /*give z-index so submenu goes above the main menu links*/
}