css模拟灯光扫描效果

正文开始

https://segmentfault.com/a/1190000039019827 ~~~ dashed border animation
~~~ [/upload/post_files/sIxU8vNny2QPXESf.html](/upload/post_files/sIxU8vNny2QPXESf.html)

正文结束

Flex 布局教程:语法篇 css 用图片平铺边框