diff --git a/src/elements/block.typ b/src/elements/block.typ
index 47d55a1..0fc023b 100644
--- a/src/elements/block.typ
+++ b/src/elements/block.typ
@@ -1,7 +1,7 @@
 #import "@preview/cetz:0.3.2": draw
 #import "element.typ"
 
-#let draw-shape(id, tl, tr, br, bl, fill, stroke, radius) = {
+#let draw-shape(id, tl, tr, br, bl, fill, stroke, radius: 0.5em) = {
   let f = draw.rect(
     radius: radius,
     inset: 0.5em,