Would you please tell me why my mask does not display, before setting the superclass absolute positioning, mask cover is full screen, since set!!!!!!

CodePudding user response:

The mask {
Border: 1 px solid red;/* see your mask in which position */
}

CodePudding user response:

You can have a look at the positioning problem:
Url is as follows:
http://www.xinbiancheng.cn/css/5ecd0f4855ae070fb7141d52.html