html - 对齐::之前和::之后伪元素

Question

谁能解释一下我在这个例子中做错了什么？我正在尝试创建两边都有线条的 div。

.bottom-logo {
  width: 50px;
  height: 50px;
  border-radius: 100%;
  background-color: orange;
  margin: 0 auto;
  position: relative;
}

.bottom-logo::before {
  content: "";
  margin-right: 50px;
  margin-top: 20px;
  border-bottom: 4px solid black;
  display: inline-block;
  width: 100px;
  float: right;
}

.bottom-logo::after {
  content: "";
  display: inline-block;
  border-bottom: 4px solid black;
  width: 100px;
  margin-left: 50px;
}

<div class="bottom-logo"></div>

Answer 1

我建议对伪元素使用绝对位置。还更新为使用百分比值以使其更加灵活。

.bottom-logo {
  width: 50px;
  height: 50px;
  border-radius: 100%;
  background-color: orange;
  margin: 0 auto;
  position: relative;
}

.bottom-logo::before,
.bottom-logo::after {
  content: "";
  border-bottom: 4px solid black;
  width: 100px;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}

.bottom-logo::before {
  right: 100%;
}

.bottom-logo::after {
  left: 100%;
}

<div class="bottom-logo"></div>

或者，您可以添加 <span>标记然后使用垂直对齐的内联 block 。

.bottom-logo {
  text-align: center;
}

.bottom-logo span {
  display: inline-block;
  vertical-align: middle;
  width: 50px;
  height: 50px;
  border-radius: 100%;
  background-color: orange;
}

.bottom-logo::before,
.bottom-logo::after {
  display: inline-block;
  vertical-align: middle;
  content: "";
  border-bottom: 4px solid black;
  width: 100px;
}

<div class="bottom-logo"><span></span></div>

另一种方法是使用 flexbox 和 <span>标签左右。

.bottom-logo {
  display: flex;
  justify-content: center;
  align-items: center;
}

.bottom-logo span {
  width: 50px;
  height: 50px;
  border-radius: 100%;
  background-color: orange;
}

.bottom-logo::before,
.bottom-logo::after {
  content: "";
  border-bottom: 4px solid black;
  width: 100px;
}

<div class="bottom-logo"><span></span></div>