diff --git a/Makefile b/Makefile
index aaf76ae..d16f5a7 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@ endif
 size?=1024
 dark_color?=black
 light_color?=white
-middle_color?=gray
+middle_color?=transparent
 
 # Base targets
 default: build