diff --git a/test/png_test.exs b/test/png_test.exs
index 78ef223..437b1ff 100644
--- a/test/png_test.exs
+++ b/test/png_test.exs
@@ -14,7 +14,7 @@ defmodule EQRCode.PNGTest do
 
   test "Generate an html page with different types of PNG images", %{qr: qr} do
     color = <<0, 0, 255>>
-    background_color = <<255, 0, 0>>
+    background_color = <<255, 255, 0>>
 
     pngs =
       []
diff --git a/test/svg_test.exs b/test/svg_test.exs
index 695c299..74ed32d 100644
--- a/test/svg_test.exs
+++ b/test/svg_test.exs
@@ -12,7 +12,7 @@ defmodule EQRCode.SVGTest do
 
   test "Generate an html page with different types of SVG images", %{qr: qr} do
     color = "blue"
-    background_color = "red"
+    background_color = "yellow"
 
     svgs =
       []