diff --git a/docs/config.toml b/docs/config.toml
index 0cdc78c3b3..08202ae0f3 100644
--- a/docs/config.toml
+++ b/docs/config.toml
@@ -69,6 +69,16 @@ contentDir = "content/ja"
 time_format_default = "2006年01月02日"
 time_format_blog = "2006年01月02日"
 
+[markup]
+[markup.goldmark]
+[markup.goldmark.renderer]
+unsafe = true
+[markup.highlight]
+# See a complete list of available styles at https://xyproto.github.io/splash/docs/all.html
+style = "tango"
+# Uncomment if you want your chosen highlight style used for code blocks without a specified language
+# guessSyntax = "true"
+
 # Everything below this are Site Params
 
 [params]