diff --git a/apps/macos/Sources/Clawdis/Resources/WebChat/index.html b/apps/macos/Sources/Clawdis/Resources/WebChat/index.html
index 203147304..037ab1c71 100644
--- a/apps/macos/Sources/Clawdis/Resources/WebChat/index.html
+++ b/apps/macos/Sources/Clawdis/Resources/WebChat/index.html
@@ -7,11 +7,11 @@
   <link rel="stylesheet" href="app.css">
   <style>
     html, body { height: 100%; margin: 0; padding: 0; }
-    #app { height: 100%; }
+    #app { height: 100%; padding: 0; margin: 0; }
   </style>
 </head>
 <body>
-  <div id="app" style="padding:16px;font:14px -apple-system, BlinkMacSystemFont, sans-serif;color:#222">Booting web chat…</div>
+  <div id="app" style="font:14px -apple-system, BlinkMacSystemFont, sans-serif;color:#222">Booting web chat…</div>
   <script type="module" src="webchat.bundle.js"></script>
 </body>
 </html>
diff --git a/apps/macos/Sources/Clawdis/WebChatWindow.swift b/apps/macos/Sources/Clawdis/WebChatWindow.swift
index 262d59d99..783bf1100 100644
--- a/apps/macos/Sources/Clawdis/WebChatWindow.swift
+++ b/apps/macos/Sources/Clawdis/WebChatWindow.swift
@@ -114,7 +114,7 @@ final class WebChatWindowController: NSWindowController, WKNavigationDelegate, N
 
     private func loadPlaceholder() {
         let html = """
-        <html><body style='font-family:-apple-system;padding:24px;color:#888'>Connecting to web chat…</body></html>
+        <html><body style='font-family:-apple-system;margin:0;padding:0;display:flex;align-items:center;justify-content:center;height:100vh;color:#888'>Connecting to web chat…</body></html>
         """
         self.webView.loadHTMLString(html, baseURL: nil)
     }
@@ -290,7 +290,7 @@ final class WebChatWindowController: NSWindowController, WKNavigationDelegate, N
     private func showError(_ text: String) {
         self.bootWatchTask?.cancel()
         let html = """
-        <html><body style='font-family:-apple-system;padding:24px;color:#c00'>Web chat failed to connect.<br><br>\(
+        <html><body style='font-family:-apple-system;margin:0;padding:0;display:flex;align-items:center;justify-content:center;height:100vh;color:#c00'>Web chat failed to connect.<br><br>\(
             text)</body></html>
         """
         self.webView.loadHTMLString(html, baseURL: nil)
