diff --git a/static/css/theme-relearn-light.css b/static/css/theme-relearn-light.css
index 1bc6a5abdf..1fac8baeb1 100644
--- a/static/css/theme-relearn-light.css
+++ b/static/css/theme-relearn-light.css
@@ -23,6 +23,9 @@
     --CODE-INLINE-BG-color: #fffae9; /* background color of inline code */
     --CODE-INLINE-BORDER-color: #f8e8c8; /* border color of inline code */
 
+    --MERMAID-theme: default; /* name of the default Mermaid theme for this variant, can be overridden in config.toml */
+    --SWAGGER-theme: light; /* name of the default Swagger theme for this variant, can be overridden in config.toml */
+
     --MENU-HOME-LINK-color: #323232; /* home button color if configured */
     --MENU-HOME-LINK-HOVER-color: #808080; /* hoverd home button color if configured */