diff --git a/src/renderer.typ b/src/renderer.typ
index 1a72fb2..238a0fb 100644
--- a/src/renderer.typ
+++ b/src/renderer.typ
@@ -449,7 +449,8 @@
     (
       width: auto,
       height: auto,
-      fill: config.background
+      fill: config.background,
+      margin: 0cm
     )
   } else {
     (:)
diff --git a/src/schema.typ b/src/schema.typ
index 112540c..a3328ba 100644
--- a/src/schema.typ
+++ b/src/schema.typ
@@ -27,7 +27,7 @@
   let lang = schema.lang
   let content = schema.text
   if not lang in valid-extensions {
-    let fmts = valid-extensions.map(fmt => "." + fmt).join(", ")
+    let fmts = valid-extensions.join(", ")
     fmts = "(" + fmts + ")"
     panic("Unsupported format '" + lang + "'. Valid formats: " + fmts)
   }