使用 :after 在元素后添加一个空格 (" ") - Add a space (" ") after an element using :after

问题：

I want to add a blank space after some content, however the content: " ";我想在一些内容后添加一个空格，但是content: " "; doesn't seem to work.似乎不起作用。

This is my code:这是我的代码：

h2:after {
    content: " ";
}

... which doesn't work, however this does: ...这不起作用，但是这样做：

h2:after {
    content: "-";
}

What am I doing wrong?我究竟做错了什么？

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解决方案：

参考一： https://stackoom.com/question/MwNB
参考二： Add a space (" ") after an element using :after