html - 将阴影和 z-index 应用于绝对定位元素

Question

我正在尝试在导航栏中实现一个凸起，导航栏应该有一个框阴影......但是底部也需要它......不知何故我不能把凸起放在导航栏，这是一个已知问题还是我遗漏了什么？非常感谢。

body {
  background: beige;
}

.c-header {
  background: white;
  box-shadow: 0 2px 2px rgba(0, 0, 0, 0.8);
  height: 60px;
  position: fixed;
  width: 100%;
  z-index: 9999;
}

.c-site-nav {
  align-content: center;
  display: flex;
  justify-content: space-between;
}
.c-site-nav ul {
  margin-left: 0;
}
.c-site-nav__item {
  display: flex;
  justify-content: space-around;
  list-style: none;
  width: 40%;
}
.c-site-nav__item a {
  font-size: 20px;
  color: grey;
  display: inline-block;
  text-decoration: none;
}

.c-logo {
  position: absolute;
  left: 50%;
  transform: translate(-50%, 0);
  padding: 0;
  position: absolute;
  top: 15px;
  width: 45px;
  z-index: 1;
}
.c-logo::after {
  box-shadow: 0 2px 2px rgba(0, 0, 0, 0.8);
  position: absolute;
  left: 50%;
  transform: translate(-50%, 0);
  background: white;
  border-radius: 50%;
  content: '';
  height: 60px;
  position: absolute;
  width: 60px;
  z-index: -100;
}

<header class="c-header">
  <div class="c-logo">
  </div>
  <nav class="c-site-nav">
    <ul class="c-site-nav__item">
        <li><a href="/">asd</a></li>
        <li><a href="/ueber_uns">asd</a></li>
        <li><a href="/">asd</a></li>
    </ul>
    <ul class="c-site-nav__item">
        <li><a href="/">asd</a></li>
        <li><a href="/">asd</a></li>
        <li><a href="tel:+49234234234">34234234</a></li>
    </ul>
  </nav>
</header>

Answer 1

我不知道这是否是预期的结果，但我设法通过将

  <div class="c-logo">

在标题元素之外。

body {
  background: beige;
}

.c-header {
  background: white;
  box-shadow: 0 2px 2px rgba(0, 0, 0, 0.8);
  height: 60px;
  position: fixed;
  width: 100%;
  z-index: 9999;
}

.c-site-nav {
  align-content: center;
  display: flex;
  justify-content: space-between;
}
.c-site-nav ul {
  margin-left: 0;
}
.c-site-nav__item {
  display: flex;
  justify-content: space-around;
  list-style: none;
  width: 40%;
}
.c-site-nav__item a {
  font-size: 20px;
  color: grey;
  display: inline-block;
  text-decoration: none;
}

.c-logo {
  position: absolute;
  left: 50%;
  transform: translate(-50%, 0);
  padding: 0;
  position: absolute;
  top: 15px;
  width: 45px;
  z-index: 1;
}
.c-logo::after {
  box-shadow: 0 2px 2px rgba(0, 0, 0, 0.8);
  position: absolute;
  left: 50%;
  transform: translate(-50%, 0);
  background: white;
  border-radius: 50%;
  content: '';
  height: 60px;
  position: absolute;
  width: 60px;
  z-index: -100;
}

<header class="c-header">
  </div>
  <nav class="c-site-nav">
    <ul class="c-site-nav__item">
        <li><a href="/">asd</a></li>
        <li><a href="/ueber_uns">asd</a></li>
        <li><a href="/">asd</a></li>
    </ul>
    <ul class="c-site-nav__item">
        <li><a href="/">asd</a></li>
        <li><a href="/">asd</a></li>
        <li><a href="tel:+49234234234">34234234</a></li>
    </ul>
  </nav>
</header>
  <div class="c-logo">