.kong{width: 200rpx;height: 76rpx;background:  linear-gradient(to bottom right, #E5E5E5 0%, rgba(0, 0, 0, 0.1) calc(50% - 1px),#175CFF 50%, rgba(0, 0, 0, 0.1) calc(50% + 1px),rgba(0, 0, 0, 0.1) 100%);}

参考：
https://blog.csdn.net/weixin_38779534/article/details/104778147