diff --git a/src/textual/widgets/_markdown.py b/src/textual/widgets/_markdown.py
index 4c8bb5b16..1328fa5b2 100644
--- a/src/textual/widgets/_markdown.py
+++ b/src/textual/widgets/_markdown.py
@@ -206,6 +206,7 @@ class MarkdownHorizontalRule(MarkdownBlock):
         border-bottom: heavy $primary;
         height: 1;
         padding-top: 1;
+        margin-bottom: 1;
     }
     """