diff --git a/demo.html b/demo.html
index 94af417..d38c231 100644
--- a/demo.html
+++ b/demo.html
@@ -53,7 +53,7 @@
       var HIGHLIGHT_CSS_CDN =
         'https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/highlight.js/11.4.0/styles/base16/onedark.min.css'
       var GITHUB_MARKDOWN_CSS_CDN =
-        'https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/github-markdown-css/5.1.0/github-markdown-dark.min.css'
+        'https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/github-markdown-css/5.1.0/github-markdown.css'
 
       // 加载库文件
       var createScript = (src) => {