diff --git a/docs/content/playground.html b/docs/content/playground.html
index 82b6b64..8cebe50 100644
--- a/docs/content/playground.html
+++ b/docs/content/playground.html
@@ -85,6 +85,11 @@
/* attribute case insensitive */
[frame=hsides i] {
border-style: solid none;
+}
+
+/* system-ui font-family */
+body {
+font-family: system-ui;
}