diff --git a/book/src/toolbox/progress.typ b/book/src/toolbox/progress.typ
index 4b9ed38..74bfc12 100644
--- a/book/src/toolbox/progress.typ
+++ b/book/src/toolbox/progress.typ
@@ -9,8 +9,8 @@
   toolbox.progress-ratio(ratio => {
     stack(
       dir: ltr,
-      rect(stroke: blue, fill: blue, width: ratio * 8cm),
-      rect(stroke: blue, fill: none, width: (1 - ratio) * 8cm),
+      rect(stroke: blue, fill: blue, width: 8cm * ratio),
+      rect(stroke: blue, fill: none, width: 8cm * (1 - ratio)),
     )
   })
 }