如何在伪元素之前将文本居中:

问题描述：

我有这样的代码:

span {
  border-radius: 50%;
  background-color: #d8d9dd;
  border: 6px solid #262c40;
  width: 25px;
  height: 25px;
  margin: 30px 0 0 40px;
  display: block;
}
span:before {
  content: attr(data-value);
  position: relative;
  white-space: pre;
  display: inline;
  top: -27px;
  left: -29px;
  width: 200px;
  text-align: center;
}

<span data-value="November 2016"></span>
<span data-value="May 2016"></span>

如何在伪元素之前将文本居中于居中位置:居中?有可能吗?

How can I center the text inside :before pseudo element to be in the middle of the span? Is it possible?

答

最好的方法是将伪代码之前的放置在之前使用流行的居中技术针对 span :

The best thing would be to position the before pseudo element absolutely with respect to the span using the popular centering technique:

top: 0;
left: 50%;
transform: translate(-50%, -25px);

请注意，-25px用于使圆圈上方的文本偏移(高度为25px)-请参见下面的演示

Note that -25px is to offset the text above the circles (which has height 25px) - see demo below:

span {
  border-radius: 50%;
  background-color: #d8d9dd;
  border: 6px solid #262c40;
  width: 25px;
  height: 25px;
  margin: 30px 0 0 40px;
  display: block;
  position:relative;
}
span:before {
  content: attr(data-value);
  position: absolute;
  white-space: pre;
  display: inline;
  top: 0;
  left: 50%;
  transform: translate(-50%, -25px);
}

<span data-value="November 2016"></span>
<span data-value="May 2016"></span>

如何在伪元素之前将文本居中:

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