css - 位置 :after below the div

Question

我正在尝试应用在 this question 中找到的解决方案，但它不适用于我的情况。

我想把红圈放在绿线之上。

.box{
  border: 1px solid blue;
  height: 100px;
  position: relative;
  width: 100px;
}
.dot{
  background: red;
  border-radius: 50%;
  height: 30px;
  width: 30px;
  position: absolute;
  right: -15px;
  top: 50%;
  -webkit-transform: translateY(-50%);
  transform: translateY(-50%);
}
.dot:after{
  background: green;
  content: '';
  height: 100px;
  width: 10px;
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  z-index: -1;
}

<div class="box">
  <div class="dot"></div>
</div>
<div class="box">
  <div class="dot"></div>
</div>

Answer 1

你不能让红点成为 :after 而不是元素样式本身吗？

.box{
  border: 1px solid blue;
  height: 100px;
  position: relative;
  width: 100px;
}
.dot {
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 100%;
  z-index: 1;
}
.dot:after{
  background: red;
  content: '';
  border-radius: 50%;
  height: 30px;
  width: 30px;
  position: absolute;
  right: -15px;
  top: 50%;
  -webkit-transform: translateY(-50%);
  transform: translateY(-50%);
}
.dot:before{
  background: green;
  content: '';
  height: 100px;
  width: 10px;
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

<div class="box">
  <div class="dot"></div>
</div>
<div class="box">
  <div class="dot"></div>
</div>