diff --git a/css/preflight.css b/css/preflight.css
index 2730fde63..35466d2d4 100644
--- a/css/preflight.css
+++ b/css/preflight.css
@@ -508,6 +508,11 @@ fieldset {
   padding: 0;
 }
 
+ol,
+ul {
+  margin: 0;
+}
+
 /**
  * Suppress the focus outline on elements that cannot be accessed via keyboard.
  * This prevents an unwanted focus outline from appearing around elements that