I just learned how to create a custom WordPress theme. I would like to assign a class to my sidebar for styling, but I have not found anything online that explains how to do this. The code I added to my functions.php file to register my sidebar is:

```

    if ( function_exists('register_sidebar') )
    register_sidebar(array(
        'id'            => 'sidebar-1',
        'description'   => __( 'Add widgets here to appear in your sidebar.', 'twentysixteen' ),
        'before_widget' => '',
        'after_widget'  => '',
        'before_title'  => '',
        'after_title'   => '',
    ));

```

And the code I added to my sidebar.php file is:

```
<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar() ) : ?>
<?php endif; ?>

```

Any help would be greatly appreciated!