css3图像边框：border-image

https://blog.csdn.net/qq_35393869/article/details/90519066?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-1.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-1.control

原文：https://www.cnblogs.com/dalidali/p/15217642.html