diff --git a/src/app/(user)/register/_components/subpages/two.tsx b/src/app/(user)/register/_components/subpages/two.tsx
index 9f04712..1f9afbb 100644
--- a/src/app/(user)/register/_components/subpages/two.tsx
+++ b/src/app/(user)/register/_components/subpages/two.tsx
@@ -272,6 +272,12 @@ export default function Two({ setStep, form }: TwoProps) {
           <ErrorMsgFloat>{errors.drugAllergy?.message}</ErrorMsgFloat>
         </div>
 
+        <div className="relative space-y-1">
+          <Label>รหัสผู้เเนะนำให้เข้าร่วมกิจกรรม (ไม่จำเป็น)</Label>
+          <TextInput {...register('invitationCode')} placeholder="AB12345" />
+          <ErrorMsgFloat>{errors.invitationCode?.message}</ErrorMsgFloat>
+        </div>
+
         {/* idCardImg */}
         <div className="relative space-y-1">
           <Label isRequired>อัปโหลดรูปด้านหน้าบัตรประชาชน</Label>
diff --git a/src/components/profile/Background.css b/src/components/profile/Background.css
index 9080403..ba97d60 100644
--- a/src/components/profile/Background.css
+++ b/src/components/profile/Background.css
@@ -1,3 +1,3 @@
 .BG{
-    background: linear-gradient(172.63deg, #E86CA3 -5.83%, #A57FBD 39.58%, #6B8FD3 57.85%, #5D3A60 82.53%);
+    background: linear-gradient(172.63deg, #E86CA3 -5.83%, #A57FBD 39.58%, #6B8FD3 57.85%, #A57FBD 82.53%);
 }
\ No newline at end of file
diff --git a/src/components/profile/Background.tsx b/src/components/profile/Background.tsx
index 7371a1f..a9f87cd 100644
--- a/src/components/profile/Background.tsx
+++ b/src/components/profile/Background.tsx
@@ -7,7 +7,7 @@ export default function Background() {
     <>
       <Image
         src={getImageURL('/profile/Background.png')}
-        className="absolute inset-0 -z-10 opacity-70"
+        className="absolute inset-0 -z-10 opacity-50"
         fill
         alt="Background"
       />
diff --git a/src/schema/register.ts b/src/schema/register.ts
index 3587e31..d2b8686 100644
--- a/src/schema/register.ts
+++ b/src/schema/register.ts
@@ -9,6 +9,7 @@ export const RegisterSchema = z.object({
   name: z.string().min(1, 'กรุณากรอกชื่อ-นามสกุล'),
   email: z.string().email('กรุณากรอกอีเมล'),
   phone: z.string().regex(/^\d.{9}$/, 'กรุณากรอกเลขเบอร์ 10 หลัก'),
+  invitationCode: z.string(),
   age: z
     .string({
       message: 'กรุณากรอกอายุ',