diff --git a/django/contrib/admin/static/admin/css/base.css b/django/contrib/admin/static/admin/css/base.css
index 7596fde000..4b8acea239 100644
--- a/django/contrib/admin/static/admin/css/base.css
+++ b/django/contrib/admin/static/admin/css/base.css
@@ -221,7 +221,6 @@ hr {
     border: none;
     margin: 0;
     padding: 0;
-    font-size: 1px;
     line-height: 1px;
 }