diff --git a/script.js b/script.js
index 96d033c..7e4047c 100644
--- a/script.js
+++ b/script.js
@@ -1,5 +1,23 @@
 const reponse = "train";
 var word ="";
+const good_letter_color = "#3fbe00";
+const bad_letter_color = "#BE0000";
+const mid_letter_coloer = "#BF8200";
+
+function change_color_good_letter(coord){
+    var case_div = document.getElementById(coord);
+    case_div.style.backgroundColor = good_letter_color;
+}
+
+function change_color_bad_letter(coord){
+    var case_div = document.getElementById(coord);
+    case_div.style.backgroundColor = bad_letter_color;
+}
+
+function change_color_mid_letter(coord){
+    var case_div = document.getElementById(coord);
+    case_div.style.backgroundColor = mid_letter_color;
+}
 
 function update(x) {
     word += x