diff --git a/.changeset/beige-dragons-appear.md b/.changeset/beige-dragons-appear.md
new file mode 100644
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+++ b/.changeset/beige-dragons-appear.md
@@ -0,0 +1,5 @@
+---
+"@primer/css": minor
+---
+
+[WIP] Convert margin utilities to rem units with fallbacks