diff --git a/ghost/admin/app/components/modal-post-share.js b/ghost/admin/app/components/modal-post-share.js
index dec29a979c..6c81797957 100644
--- a/ghost/admin/app/components/modal-post-share.js
+++ b/ghost/admin/app/components/modal-post-share.js
@@ -11,7 +11,7 @@ export default class PostShareModal extends Component {
     @service notifications;
 
     static modalOptions = {
-        className: 'fullscreen-modal-wide fullscreen-modal-action modal-post-success'
+        className: 'fullscreen-modal-action modal-post-success'
     };
 
     get post() {
diff --git a/ghost/admin/app/components/modal-post-success.js b/ghost/admin/app/components/modal-post-success.js
index 32ed28216c..40a8edd5b6 100644
--- a/ghost/admin/app/components/modal-post-success.js
+++ b/ghost/admin/app/components/modal-post-success.js
@@ -11,7 +11,7 @@ export default class PostSuccessModal extends Component {
     @service notifications;
 
     static modalOptions = {
-        className: 'fullscreen-modal-wide fullscreen-modal-action modal-post-success'
+        className: 'fullscreen-modal-action modal-post-success'
     };
 
     get post() {
diff --git a/ghost/admin/app/styles/components/modals-new.css b/ghost/admin/app/styles/components/modals-new.css
index 3f63b5d0a3..b29a9be57c 100644
--- a/ghost/admin/app/styles/components/modals-new.css
+++ b/ghost/admin/app/styles/components/modals-new.css
@@ -178,6 +178,39 @@
     ;
 }
 
+.modal-post-success .modal-content {
+    padding: 40px;
+    border-radius: 12px;
+}
+
+.modal-post-success .modal-image {
+    margin: -40px -40px 40px!important;
+}
+
+.modal-post-success .modal-image img {
+    border-radius: 12px 12px 0 0!important;
+}
+
+.modal-post-success .modal-content .modal-header h1 { 
+    font-size: 3.6rem;
+}
+
+.modal-post-success .modal-body {
+    font-size: 1.8rem;
+}
+
+.modal-post-success .modal-footer {
+    margin-top: 4rem;
+}
+
+.modal-post-success .modal-footer .gh-btn {
+    height: 44px!important;
+}
+
+.modal-post-success .modal-footer .gh-btn span {   
+    font-size: 1.6rem;
+}
+
 .modal-content * {
     user-select: text;
 }
diff --git a/ghost/admin/app/styles/components/modals.css b/ghost/admin/app/styles/components/modals.css
index 020294a2fb..be0324353a 100644
--- a/ghost/admin/app/styles/components/modals.css
+++ b/ghost/admin/app/styles/components/modals.css
@@ -65,6 +65,11 @@
     max-width: 720px;
 }
 
+.modal-post-success {
+    width: 100%;
+    max-width: 640px;
+}
+
 .fullscreen-modal-narrow {
     width: 100%;
     max-width: 420px;