diff --git a/apps/cprassist/cprassist.js b/apps/cprassist/cprassist.js
index 3e34ea171..ee5b06131 100644
--- a/apps/cprassist/cprassist.js
+++ b/apps/cprassist/cprassist.js
@@ -42,7 +42,7 @@ function drawHeart() {
 }
 
 function updateScreen() {
-  const colors = [0xFFFF, 0x9492];
+  const colors = [0xFFFF-g.getBgColor(), 0x9492];
   g.reset().clearRect(0, 0, 250, g.getHeight()*5/6);
   if (counter > 0) {
     g.setFont("Vector", 40).setFontAlign(0, 0);