diff --git a/ghost/members-api/static/auth/pages/SignupCompletePage.js b/ghost/members-api/static/auth/pages/SignupCompletePage.js
index 8f517801c3..51752b5597 100644
--- a/ghost/members-api/static/auth/pages/SignupCompletePage.js
+++ b/ghost/members-api/static/auth/pages/SignupCompletePage.js
@@ -4,7 +4,7 @@ import { IconSignupComplete } from '../components/icons';
 import Form from '../components/Form';
 
 export default ({ error, handleSubmit, siteConfig }) => (
-    <div className="gm-modal-form">
+    <div className="gm-modal-form gm-signup-complete-page">
         <Form bindTo="signup" onSubmit={ handleSubmit }>
             <div class="flex flex-column items-center">
                 <span>{ IconSignupComplete }</span>
diff --git a/ghost/members-api/static/auth/styles/screen.css b/ghost/members-api/static/auth/styles/screen.css
index e36012daa6..3e89c0527a 100644
--- a/ghost/members-api/static/auth/styles/screen.css
+++ b/ghost/members-api/static/auth/styles/screen.css
@@ -218,7 +218,8 @@ a:hover {
 .gm-signin-page,
 .gm-signup-page,
 .gm-subscribe-page,
-.gm-reset-pwd-page {
+.gm-reset-pwd-page,
+.gm-signup-complete-page {
     animation: fadeInPage 0.6s ease 1;
 }