diff --git a/docs/building-electronics/what-are-electronics-made-of.mdx b/docs/building-electronics/what-are-electronics-made-of.mdx
index b5a1d8a..aee14d8 100644
--- a/docs/building-electronics/what-are-electronics-made-of.mdx
+++ b/docs/building-electronics/what-are-electronics-made-of.mdx
@@ -62,6 +62,7 @@ the top layer can pass to the bottom.
 
 
 export default () => (
+<board width="5mm" height="5mm">
   <footprint>
     <via
       toLayer="bottom"
@@ -70,6 +71,7 @@ export default () => (
       outerDiameter="0.6mm"
     />
   </footprint>
+</board>
 )
 
 `} />