粘性导航显示在覆盖上方

Question

我在页面的左侧有一个垂直的导航栏，并有一个带有下拉菜单的顶部标题，当其中一项被下拉时，导航栏显示在下拉菜单的顶部，当我有{{ 1}}，当我更改z-index: 0时，导航栏显示在下拉菜单下，但链接不再可单击。

我尝试将z-index: -1中的z-index更改为非常高的值，但它仍显示在顶部。

我该怎么做才能使导航栏显示在叠加层下，但仍可单击该项目？

这是相关的CSS：

.sub-content

可点击，但显示在叠加层nav.right>ul { overflow: auto; list-style: none; margin-left: 0; padding-left: 0; height: calc(100vh - 80px); position: sticky; z-index: 0; top: 60px; } 上方：

z-index: 0

nav.right>ul {
  overflow: auto;
  list-style: none;
  margin-left: 0;
  padding-left: 0;
  height: calc(100vh - 80px);
  position: sticky;
  z-index: 0;
  top: 60px;
}

a { color: skyblue; }

main {
  display: flex;
  margin: auto;
}

main>nav {
  width: 20%;
}

main {
  width: 80%;
  padding-left: 20px;
}

.sub-content>div>ul {
  list-style-type: none;
}

.sub-content {
  position: absolute;
  left: 0;
  right: 0;
  padding: 0;
  display: none;
  background: #292929;
  padding: 5vh 0;
}

.sub-content>div:first-child {
  width: 25vw;
  position: relative;
  left: 0;
  right: 0;
  margin: auto;
}

nav.top>ul>li:hover>.sub-content {
  display: block;
}

.sub-content>div>ul>li>a {
  color: #ffffff;
  padding: 5px 10px;
  font-size: 0.9rem;
  text-decoration: none;
  display: block;
}

.sub-content>div>ul>li>a:hover {
  /* background: #ee2012; */
  text-decoration: underline;
}

nav.top {
  background: #f44336;
  display: flex;
  flex-direction: row;
  justify-content: center;
  position: sticky;
  top: 0;
}

nav.top>ul {
  margin: 0;
  display: flex;
  flex-direction: row;
  list-style-type: none;
}

nav.top>ul>li>a {
  display: inline-block;
  padding: 1rem 1.5rem;
  color: #ffffff;
  text-decoration: none;
}

nav.top>ul>li>a:hover,
nav.top>ul>li>a.router-link-exact-active {
  background: #ee2012;
}

不可点击，但显示在叠加层<nav class="top"> <ul> <li> <a href="">Item</a> <div class="sub-content"> <div> <ul> <li><a href="">Sub Item</a></li> <li><a href="">Sub Item</a></li> </ul> </div> </div> </li> </ul> </nav> <main> <nav class="right"> <ul> <li><a href="">Abc</a></li> <li><a href="">Abc</a></li> <li><a href="">Abc</a></li> <li><a href="">Abc</a></li> <li><a href="">Abc</a></li> <li><a href="">Abc</a></li> <li><a href="">Abc</a></li> <li><a href="">Abc</a></li> <li><a href="">Abc</a></li> <li><a href="">Abc</a></li> </ul> </nav> <div class="content"> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> <p>Dummy Text</p> </div> </main>下：

z-index: -1

nav.right>ul {
  overflow: auto;
  list-style: none;
  margin-left: 0;
  padding-left: 0;
  height: calc(100vh - 80px);
  position: sticky;
  z-index: -1;
  top: 60px;
}

a { color: skyblue; }

main {
  display: flex;
  margin: auto;
}

main>nav {
  width: 20%;
}

main {
  width: 80%;
  padding-left: 20px;
}

.sub-content>div>ul {
  list-style-type: none;
}

.sub-content {
  position: absolute;
  left: 0;
  right: 0;
  padding: 0;
  display: none;
  background: #292929;
  padding: 5vh 0;
}

.sub-content>div:first-child {
  width: 25vw;
  position: relative;
  left: 0;
  right: 0;
  margin: auto;
}

nav.top>ul>li:hover>.sub-content {
  display: block;
}

.sub-content>div>ul>li>a {
  color: #ffffff;
  padding: 5px 10px;
  font-size: 0.9rem;
  text-decoration: none;
  display: block;
}

.sub-content>div>ul>li>a:hover {
  /* background: #ee2012; */
  text-decoration: underline;
}

nav.top {
  background: #f44336;
  display: flex;
  flex-direction: row;
  justify-content: center;
  position: sticky;
  top: 0;
}

nav.top>ul {
  margin: 0;
  display: flex;
  flex-direction: row;
  list-style-type: none;
}

nav.top>ul>li>a {
  display: inline-block;
  padding: 1rem 1.5rem;
  color: #ffffff;
  text-decoration: none;
}

nav.top>ul>li>a:hover,
nav.top>ul>li>a.router-link-exact-active {
  background: #ee2012;
}