如何使用 css 在列表项旁边添加垂直线

Question

我想在边栏菜单中的列表项之后添加一条垂直的红色/黄色线条。

对于第一个列表项，没问题，但它从第二个项目开始中断。 :after 伪选择器不会跨越整个高度。谁能告诉我哪里错了。

.sidebar {
  background-color: #09204f;
  color: white;
  width: 200px;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
}
.sidebar img {
  padding: 0px 20px;
}

body {
  margin: 25px;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item {
  font-size: 24px;
  padding: 15px 10px;
  border: 1px dashed white;
  margin: 5px 5px;
}
.nav-item .kpi-name {
  font-size: 14px;
}
.nav-item .kpi-value {
  font-size: 14px;
  font-weight: 700;
}
.nav-item.green-item:after {
  background-color: #15a859;
  border-color: #15a859;
}
.nav-item.amber-item:after {
  background-color: #f8ae0a;
  border-color: #f8ae0a;
}
.nav-item.red-item:after {
  background-color: #e73e46;
  border-color: #e73e46;
}
.nav-item:after {
  content: "";
  display: inline-block;
  float: right;
  width: 7px;
  height: 30px;
  position: relative;
  top: 0px;
  border: 1px solid #000;
  border-radius: 7px;
}

.page {
  background-color: #f3f8ff;
  position: absolute;
  top: 0;
  left: 200px;
  right: 0;
  bottom: 0;
}

<div class="main-wrap">


  <div class="sidebar">

    <div class="menu">
      <ul>
        <li class="nav-item green-item">
          Menu Item



        </li>
        <li class="nav-item amber-item">Menu 2
          <div>
            <span class="kpi-name">
              Active User
            </span>
            <span class="kpi-value">
              2400
            </span>
          </div>

        </li>
        <li class="nav-item green-item ">Menu 3</li>
      </ul>
    </div>
 
  </div>
  <div class="page">
    <h1>PAGE CONTENTS HERE</h1>
  </div>
</div>

Answer 1

父元素（li）需要position:relative并且::after元素需要绝对定位。请注意，我删除了 after 元素上的高度 - 因为至少有一个 li 中有不止一行 - 而是将顶部、右侧和底部值应用为与 li 上的填充相同。

.sidebar {
  background-color: #09204f;
  color: white;
  width: 200px;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
}
.sidebar img {
  padding: 0px 20px;
}

body {
  margin: 25px;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item {
  font-size: 24px;
  padding: 15px 10px;
  border: 1px dashed white;
  margin: 5px 5px;
  position: relative
}
.nav-item .kpi-name {
  font-size: 14px;
}
.nav-item .kpi-value {
  font-size: 14px;
  font-weight: 700;
}
.nav-item.green-item:after {
  background-color: #15a859;
  border-color: #15a859;
}
.nav-item.amber-item:after {
  background-color: #f8ae0a;
  border-color: #f8ae0a;
}
.nav-item.red-item:after {
  background-color: #e73e46;
  border-color: #e73e46;
}
.nav-item:after {
  content: "";
  display: inline-block;
  width: 7px;
  position: absolute;
  top: 15px;
  right: 10px;
  bottom: 15px;
  border: 1px solid #000;
  border-radius: 7px;
}

.page {
  background-color: #f3f8ff;
  position: absolute;
  top: 0;
  left: 200px;
  right: 0;
  bottom: 0;
}

<div class="main-wrap">


  <div class="sidebar">

    <div class="menu">
      <ul>
        <li class="nav-item green-item">
          Menu Item



        </li>
        <li class="nav-item amber-item">Menu 2
          <div>
            <span class="kpi-name">
              Active User
            </span>
            <span class="kpi-value">
              2400
            </span>
          </div>

        </li>
        <li class="nav-item green-item ">Menu 3</li>
      </ul>
    </div>
 
  </div>
  <div class="page">
    <h1>PAGE CONTENTS HERE</h1>
  </div>
</div>

Answer 2

.vl {
  border-left: 6px solid green;
  height: 500px;
}

<h2>Vertical Line</h2>
<div class="vl"></div>

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