diff --git a/lib/common/static/instance_page.css b/lib/common/static/instance_page.css
index 69b8526..72a31a5 100644
--- a/lib/common/static/instance_page.css
+++ b/lib/common/static/instance_page.css
@@ -7,9 +7,10 @@
         /* 普通屏:铺满可用宽度;带鱼屏再锁 1800(见下方 media) */
         .container{width:100%;max-width:none;margin:0 auto;padding:0 clamp(6px,1vw,14px)}
         body[data-embed-shell="1"] .container{
-            max-width:none;
             width:100%;
-            margin:0;
+            max-width:min(1800px, 100%);
+            margin-left:auto;
+            margin-right:auto;
             padding:0 clamp(6px,1vw,14px);
         }
         .header{display:flex;flex-direction:column;align-items:center;gap:8px;margin-bottom:12px}
diff --git a/lib/instance/templates/embed_shell.html b/lib/instance/templates/embed_shell.html
index a179c04..756a581 100644
--- a/lib/instance/templates/embed_shell.html
+++ b/lib/instance/templates/embed_shell.html
@@ -8,7 +8,7 @@
     <script src="/static/autofill_guard.js?v=1"></script>
     <link rel="stylesheet" href="/static/instance_theme_early.css?v=4">
     <link rel="stylesheet" href="/static/account_risk_badge.css?v=4">
-    <link rel="stylesheet" href="/static/instance_page.css?v=25">
+    <link rel="stylesheet" href="/static/instance_page.css?v=26">
     <link rel="stylesheet" href="/static/instance_theme.css?v=128">
     <script src="/static/account_risk_badge.js?v=4"></script>
     <script src="/static/open_submit_gate.js?v=1"></script>
diff --git a/lib/instance/templates/index.html b/lib/instance/templates/index.html
index 60d5b0a..46fd47b 100644
--- a/lib/instance/templates/index.html
+++ b/lib/instance/templates/index.html
@@ -18,7 +18,7 @@
     <link rel="apple-touch-icon" href="/static/icons/apple-touch-icon.png">
     <link rel="manifest" href="/static/icons/manifest.webmanifest">
     <title>{{ pwa_app_name }}</title>
-    <link rel="stylesheet" href="/static/instance_page.css?v=25">
+    <link rel="stylesheet" href="/static/instance_page.css?v=26">
     <link rel="stylesheet" href="/static/instance_theme.css?v=128">
 
 </head>