Responsive theme sidebar change

Replace:


        <?php if (!dynamic_sidebar('main-sidebar')) : ?>
        <div class="widget-wrapper">
                <div class="widget-title"><?php _e('In Archive', 'responsive'); ?></div>
                <ul>
                        <?php wp_get_archives( array( 'type' => 'monthly' ) ); ?>
                </ul>
        </div><!-- end of .widget-wrapper -->
        <?php endif; //end of main-sidebar ?>


with

        <?php if ( is_active_sidebar( 'main-sidebar' ) ) : ?>
                <?php dynamic_sidebar( 'main-sidebar' ); ?>
        <?php endif; //end of main-sidebar ?>

That way, the widget background only show up when there's content or if a widget was added.