边角位置设置

左上角  left:0;  top:0; position:absolute;

左下角  left:0;  bottom:0;  position:absolute;

右上角  right:0;   top:0;  position:absolute;

右下角  right:0;   bottom:0;   position:absolute;

转载于:https://www.cnblogs.com/jgwz/p/6367166.html