diff --git a/Change_Color_Background/js/script.js b/Change_Color_Background/js/script.js
index ea46b78..750a2e7 100644
--- a/Change_Color_Background/js/script.js
+++ b/Change_Color_Background/js/script.js
@@ -7,6 +7,6 @@ body.style.backgroundColor = 'violet'
 button.addEventListener('click', changeBackground)
 
 function changeBackground(){
-const colorIndex= parseInt(Math.random()*colors.length+1)
+const colorIndex= parseInt(Math.random()*colors.length-1)
 body.style.backgroundColor = colors[colorIndex]
 }