diff --git a/Libraries/LibWeb/CSS/QuirksMode.css b/Libraries/LibWeb/CSS/QuirksMode.css
index 2171e1b334e..0d0e448208b 100644
--- a/Libraries/LibWeb/CSS/QuirksMode.css
+++ b/Libraries/LibWeb/CSS/QuirksMode.css
@@ -5,7 +5,7 @@
  */
 
 form {
-    margin-bottom: 1em;
+    margin-block-end: 1em;
 }
 
 /* 15.3.7 Lists