请问如何设置背景图片，我想要设置一个背景图片，左面跟右面都想设置自定义图片

[zy974417577]

❓问题

我想要设置一个背景图片，如何设置啊，可以自定义设置

🤔结果 & 预期

Please describe what you expected to see.(请描述一下你希望看到什么)

🐥环境 & 设置

Node.js & npm version

Your site _config.yml (Optional)

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what platforms (operating systems and devices) are affected?

🙋Others

[JoeyBling]

请参考源码自定义样式表

yilia-plus源码目录结构及构建须知

[yansheng836]

litten/hexo-theme-yilia#859