Clean up managed user settings dialogs.

chrome/browser/resources/managed_user_passphrase_dialog.css

Index: chrome/browser/resources/managed_user_passphrase_dialog.css
diff --git a/chrome/browser/resources/managed_user_passphrase_dialog.css b/chrome/browser/resources/managed_user_passphrase_dialog.css
index 64922c44b3e727c9d510f2d27ccc9aba3f7f2470..53356d81b0498b9be7bec5a4b31d35f8271decf5 100644
--- a/chrome/browser/resources/managed_user_passphrase_dialog.css
+++ b/chrome/browser/resources/managed_user_passphrase_dialog.css
@@ -4,6 +4,7 @@
 
 #managed-mode-passphrase-page {
   min-width: 350px;
+  padding: 5px 15px;
 }
 
 #managed-user-logo {
@@ -12,10 +13,12 @@
   width: 65px;
 }
 
-#instructions,
-#entry,
-#incorrect-passphrase-warning {
-  padding: 5px 15px;
+#entry {
+  margin: 15px 0;
+}
+
+#passphrase-entry {
+  width: 100%;
 }
 
 #buttons {
@@ -26,10 +29,6 @@ html[dir=rtl] #buttons {
   float: left;
 }
 
-#buttons {
-  padding: 15px 15px;
-}
-
 #incorrect-passphrase-warning {
   color: red;
   font-weight: bold;