diff --git a/devtools/client/themes/rules.css b/devtools/client/themes/rules.css
index f418f8176eb2..8b5d81e602b8 100644
--- a/devtools/client/themes/rules.css
+++ b/devtools/client/themes/rules.css
@@ -198,6 +198,7 @@
 
   -moz-user-select: none;
   margin-bottom: 2px;
+  margin-left: 1ch;
 }
 
 .ruleview-rule-source-label {