As Raymond points out, there is a mw-submit class

diff --git a/includes/Xml.php b/includes/Xml.php
index f7e4d57..005428e 100644 (file)
--- a/includes/Xml.php
+++ b/includes/Xml.php
@@ -647,7 +647,7 @@ class Xml {
                if( $submitLabel ) {
                        $form .= Xml::openElement( 'tr', array( 'id' => $id ) );
                        $form .= Xml::tags( 'td', array(), '' );
-                       $form .= Xml::openElement( 'td', array( 'class' => 'mw-input' ) ) . Xml::submitButton( wfMsg( $submitLabel ) ) . Xml::closeElement( 'td' );
+                       $form .= Xml::openElement( 'td', array( 'class' => 'mw-submit' ) ) . Xml::submitButton( wfMsg( $submitLabel ) ) . Xml::closeElement( 'td' );
                        $form .= Xml::closeElement( 'tr' );
                }