css - 在视频缩略图上制作 css 播放按钮

Answer 1

I can't explain why but for some reason your change of methods for declaring a child element is causing the problem. Using my first two recommendations of using the unicode entity for the content and using the pseudo element rather than the pseudo class, the CSS should work. However, it did not initially work. When I removed > from the first line the CSS worked.

Here's a demo: http://jsfiddle.net/vtPhZ/4/

Your method was strange but the fact that it didn't work was even more strange...