Index: wp-admin/css/install.dev.css
===================================================================
--- wp-admin/css/install.dev.css	(revision 18636)
+++ wp-admin/css/install.dev.css	(working copy)
@@ -111,6 +111,7 @@
 	-khtml-border-radius: 3px;
 	-webkit-border-radius: 3px;
 	border-radius: 3px;
+	width: 695px;
 }
 
 .form-table {
@@ -139,7 +140,7 @@
 	background: #f3f3f3;
 }
 
-.form-table code {
+.form-table.installed code {
 	line-height: 18px;
 	font-size: 18px;
 }
Index: wp-admin/install.php
===================================================================
--- wp-admin/install.php	(revision 18636)
+++ wp-admin/install.php	(working copy)
@@ -220,7 +220,7 @@
 
 <p><?php _e( 'WordPress has been installed. Were you expecting more steps? Sorry to disappoint.' ); ?></p>
 
-<table class="form-table">
+<table class="form-table installed">
 	<tr>
 		<th><?php _e( 'Username' ); ?></th>
 		<td><code><?php echo esc_html( sanitize_user( $user_name, true ) ); ?></code></td>