Customization impossible ...

[StellaLuna 0]

Good morning everyone , I'm approaching a Prestashop but one thing I can not get out. I'm using firebug and FileSeek well as look at all the files but just do not understand . I'm trying to use the standard template and would like to customize the block " displayhome " with the module " block information custom CMS " .

In the standard template that is set inside the div " center_column " . I would like to release the div of the module in question " cmsinfo_block " to ensure that this is along the length of the site ( therefore also appear under the sidebar ) . I analyzed the file global.css and I found nothing . I analyzed the file index.tpl and needless to say that I find them just this code :

{*
* 2007-2015 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Academic Free License (AFL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/afl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2015 PrestaShop SA
*  @license    http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*}
{if isset($HOOK_HOME_TAB_CONTENT) && $HOOK_HOME_TAB_CONTENT|trim}
    {if isset($HOOK_HOME_TAB) && $HOOK_HOME_TAB|trim}
        <ul id="home-page-tabs" class="nav nav-tabs clearfix">
            {$HOOK_HOME_TAB}
        </ul>
    {/if}
    <div class="tab-content">{$HOOK_HOME_TAB_CONTENT}</div>
{/if}
</div>
{if isset($HOOK_HOME) && $HOOK_HOME|trim}
    <div class="clearfix">{$HOOK_HOME}</div>
{/if}

Where the div " center_column " even the shadow ... So how do I find and bring the line of the form as I want ?

Thanks to all