位置：在div之后

Question

我正在尝试应用this question中找到的解决方案，但在我的情况下它不起作用。

我想把红色圆圈带到绿线上方。

.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

难道你不能只让红点成为:after而不是元素样式吗？

.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>