边框属性学习

Border: border-width border-style border-color|initial|inherit;

p { border: 5px solid red; }
9.border-image-repeat: stretch(伸展)|repeat|round|initial|inherit(继承);

10. border-image-slice(如何切边)
    #borderimg { border-image-slice: 30; }

11. border-radius: 25px; （设置边角的弧度）

12. border-image-source
    #borderimg { border-image-source: url(border.png); }

The z-index property specifies the stack order of an element.