Index: wp-includes/theme.php
===================================================================
--- wp-includes/theme.php	(revision 25477)
+++ wp-includes/theme.php	(working copy)
@@ -1188,9 +1188,12 @@
 
 		$style .= $image . $repeat . $position . $attachment;
 	}
+
+    $css_selector = apply_filters( 'custom_background_css_selector', 'body.custom-background' );
+
 ?>
 <style type="text/css" id="custom-background-css">
-body.custom-background { <?php echo trim( $style ); ?> }
+<?php echo trim( $css_selector ); ?> { <?php echo trim( $style ); ?> }
 </style>
 <?php
 }
@@ -1750,4 +1753,4 @@
 		}());
 	</script>
 	<?php
-}
\ No newline at end of file
+}