diff --git a/hugo.toml b/hugo.toml
index 7720154..c7bf28b 100644
--- a/hugo.toml
+++ b/hugo.toml
@@ -3,14 +3,17 @@ baseURL = 'https://shuosc.github.io/slides'
 canonifyURLs = true  # Fix GitHub Pages wrong path
 
 [outputs]
-  home = ["HTML", "RSS", "JSON"]
+home = ["HTML", "RSS", "JSON"]
 
 [markup.tableOfContents]
-  startLevel = 1
-  endLevel = 4
+startLevel = 1
+endLevel = 4
+
+[markup.goldmark.renderer]
+unsafe = true
 
 [minify]
-  disableHTML = true
+disableHTML = true
 
 [outputFormats.Reveal]
 baseName = "index"