/*
Theme Name: Oritina
Theme URI: http://wpbingosite.com/wordpress/oritina/
Author: Wpbingo
Author URI: http://wpbingosite.com/
Description: Oritina is a modern, clean and professional WooCommerce WordPress theme. It is built to well suit for any online stores: electronics store, fashion store, jewelry store...
Version: 1.3.9
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Tags: blog, two-columns, left-sidebar, accessibility-ready, custom-background, custom-colors, custom-header, custom-logo, custom-menu, editor-style, featured-images, microformats, post-formats, rtl-language-support, sticky-post, threaded-comments, translation-ready
Text Domain: oritina
*/

.bypostauthor {
	font-style: italic;
	font-size: 13px;
	color: #757575;
}
<?php
function register_woocommerce_sidebar() {
    register_sidebar(array(
        'name'          => 'WooCommerce Sidebar',
        'id'            => 'woocommerce_sidebar',
        'description'   => 'Sidebar pour la boutique WooCommerce',
        'before_widget' => '<div class="widget">',
        'after_widget'  => '</div>',
        'before_title'  => '<h3>',
        'after_title'   => '</h3>',
    ));
}
add_action('widgets_init', 'register_woocommerce_sidebar');