Please tell me how to use z-index_html/css_WEB-ITnose

http://q.163.com/sina163/
It’s not an advertisement. It should be that he used a special method to cover up all the original information. NetEase’s original information was used z-index:, Absolute positioning, a fixed-size layer, but I can’t use it. I don’t understand. What kind of vulnerability is this?

Reply to the discussion (solution)

Please post your code.

Directly upload the code

plus

position:absolute;

http://www.zhangxinxu.com/wordpress/2011/08/css relative positioning absolute positioning five z -index/
Please take a look at this.

z-index requires position:absolute or position:relative to take effect.

z-index is only useful for DOM objects at the same level. If it is a nested relationship, the child object is always on top