fix:change styling when checkout button is disabled

_dev/js/cart.js

@@ -24,6 +24,10 @@ const CheckUpdateQuantityOperations = {
       (errorMsg !== "" && !hasError)
     ) {
       $checkoutBtn.addClass("disabled");
+      $checkoutBtn.css({
+        'background-color': 'grey',  
+        'color': 'white',                     
+      });
     }
 
     if (errorMsg !== "") {
@@ -46,6 +50,11 @@ const CheckUpdateQuantityOperations = {
       isUpdateOperation = false;
       $(prestashop.themeSelectors.notifications.container).html("");
       $checkoutBtn.removeClass("disabled");
+      $checkoutBtn.css({
+        'background-color': '#172554',  
+        'color': 'white',                    
+      });
+      
     }
   },
   checkUpdateOperation: (resp) => {