How to remove sidebar from pages?

Hello,

Please anyone let me know how can I remove sidebar from all of my pages.

I am using Figero theme here is code of sidebar.php

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<!--Start Sidebar wrapper-->
<div class="grid_8 omega">
    <div class="sidebar">
        <?php if (!dynamic_sidebar('primary-widget-area')) : ?>
            <h3>
                <?php _e('Categories', 'figero'); ?>
            </h3>

<ul>
                <?php wp_list_categories('title_li'); ?>
            </ul>
            <h3>
                <?php _e('Archives', 'figero'); ?>
            </h3>

<ul>
                <?php wp_get_archives('type=monthly'); ?>
            </ul>
            <h3>Search:</h3>
            <?php get_search_form(); ?>
        <?php endif; // end primary widget area ?>
        <?php
        // A second sidebar for widgets, just because.
        if (is_active_sidebar('secondary-widget-area')) :
            ?>
            <?php dynamic_sidebar('secondary-widget-area'); ?>
        <?php endif; ?>
    </div>
</div>
<!--End Sidebar wrapper-->

If I delete this code sidebar disappear but the width of page remain small.
Please, help.

Thanks,