diff --git a/gh.css b/gh.css
index 3ee13df..29e7206 100644
--- a/gh.css
+++ b/gh.css
@@ -29,10 +29,16 @@
   font-family: sans-serif;
 }
 
-.RktBlk {
+.SCodeFlow {
   background-color: #f8faf8;
   white-space: inherit;
   text-align: left;
+  border-top-width: 6px;
+  border-top-style: solid;
+  border-top-color: #f0f0f0;
+  border-left-width: 6px;
+  border-left-style: solid;
+  border-left-color: #f0f0f0;
 }