diff --git a/bitplane-thingie.p8 b/bitplane-thingie.p8
index aefc563..b860bee 100644
--- a/bitplane-thingie.p8
+++ b/bitplane-thingie.p8
@@ -87,6 +87,11 @@ end
 
 function draw_ui()
  poke(0x5f5e, 0xff)
+ rectfill(1, 113, 126, 126, 6)
+ rect(0,112,0,127,7)
+ rect(0,112,127,112,7)
+ rect(127,112,127,127,5)
+ rect(0,127,127,127,5)
 end
 
 function handle_ui_click(x, y)