Возможно ли,через style.css ограничить отступ как показано на скриншоте ?

http://prntscr.com/53z0nr

чтобы граница "тела" была заподлицо с триколором и черной панелью ?

Открыть globalTemplate, найти:

 

           <!-- ::: BRANDING STRIP: Logo and search box ::: -->
           <div id='branding'>
               <div class='main_width'>
                   <div id='logo'>
                       <if test="brandingBar:|:ipsRegistry::$applications[ $this->registry->getCurrentApplication() ]['hasCustomHeader']">
                           {parse template="overwriteHeader" group="{current_app}_global" params=""}
                       <else />
                           {parse template="defaultHeader" group="global" params=""}
                       </if>
                   </div>
                   <if test="canSearch:|:$this->memberData['g_use_search'] && $this->settings['allow_search']">
                       {parse template="quickSearch" group="global" params=""}
                   </if>
               </div>
           </div>
           <!-- ::: APPLICATION TABS ::: -->
           <div id='primary_nav' class='clearfix'>
               <div class='main_width'>
                   <ul class='ipsList_inline' id='community_app_menu'>
                       <if test="showQuickNav:|:! ( ! $this->memberData['member_id'] && $this->settings['force_login'] ) && !($this->settings['board_offline'] && !$this->memberData['g_access_offline']) && $this->memberData['g_view_board']">
                           <li class='right'>
                               <a href="{parse url="app=core&module=global&section=navigation&inapp={parse expression="IPS_APP_COMPONENT"}" base="public"}" rel="quickNavigation" accesskey='9' id='quickNavLaunch' title='{$this->lang->words['launch_quicknav']}'><span> </span></a>
                           </li>
                       </if>
                       <li id='nav_explore' class='right'>
                           <a href='{parse url="app=core&module=search&do=viewNewContent&search_app=<if test="viewnewcontentapp:|:$this->registry->getCurrentApplication() != 'core' AND IPSLib::appIsSearchable( $this->registry->getCurrentApplication() )">{$this->registry->getCurrentApplication()}<else />forums</if>" base="public"}' accesskey='2' title='{$this->lang->words['view_new_posts']}'>{$this->lang->words['view_new_posts']}</a>
                       </li>
                       <if test="showhomeurl:|:$this->settings['home_url'] AND $this->settings['home_name']">
                           <li id='nav_home' class='left'><a href='{$this->settings['home_url']}' title='{$this->lang->words['homepage_title']}' rel="home">{$this->settings['home_name']}</a></li>
                       </if>
                       <if test="hasCustomPrimaryNavigation:|:!empty($header_items['primary_navigation_menu'])">
                           {$header_items['primary_navigation_menu']}
                       <else />
                           <if test="applicationsloop:|:is_array($header_items['applications']) AND count($header_items['applications'])">
                               <foreach loop="applications:$header_items['applications'] as $data">
                                   <if test="showingapp:|:$data['app_show']">
                                       {parse variable="appActive" default="" oncondition="$data['app_active']" value="active"}
                                       <li id='nav_app_{$data['app_dir']}' class="left {parse variable="appActive"}"><a href='{parse url="{$data['app_link']}" seotitle="{$data['app_seotitle']}" template="{$data['app_template']}" base="{$data['app_base']}"}' title='{parse expression="sprintf( $this->lang->words['go_to_prefix'], IPSLib::getAppTitle($data['app_dir']) )"}'>{IPSLib::getAppTitle($data['app_dir'])}</a></li>
                                   </if>
                               </foreach>
                           </if>
                       </if>
                       <li id='nav_other_apps' style='display: none'>
                           <a href='#' class='ipbmenu' id='more_apps'>{$this->lang->words['more_apps']} <img src='{$this->settings['img_url']}/useropts_arrow.png' /></a>
                       </li>
                   </ul>
               </div>
           </div>

 

Заменить на:

 

           <!-- ::: BRANDING STRIP: Logo and search box ::: -->
           <div id='branding' class='main_width'>
                   <div id='logo'>
                       <if test="brandingBar:|:ipsRegistry::$applications[ $this->registry->getCurrentApplication() ]['hasCustomHeader']">
                           {parse template="overwriteHeader" group="{current_app}_global" params=""}
                       <else />
                           {parse template="defaultHeader" group="global" params=""}
                       </if>
                   </div>
                   <if test="canSearch:|:$this->memberData['g_use_search'] && $this->settings['allow_search']">
                       {parse template="quickSearch" group="global" params=""}
                   </if>
           </div>
           <!-- ::: APPLICATION TABS ::: -->
           <div id='primary_nav' class='main_width clearfix'>
                   <ul class='ipsList_inline' id='community_app_menu'>
                       <if test="showQuickNav:|:! ( ! $this->memberData['member_id'] && $this->settings['force_login'] ) && !($this->settings['board_offline'] && !$this->memberData['g_access_offline']) && $this->memberData['g_view_board']">
                           <li class='right'>
                               <a href="{parse url="app=core&module=global&section=navigation&inapp={parse expression="IPS_APP_COMPONENT"}" base="public"}" rel="quickNavigation" accesskey='9' id='quickNavLaunch' title='{$this->lang->words['launch_quicknav']}'><span> </span></a>
                           </li>
                       </if>
                       <li id='nav_explore' class='right'>
                           <a href='{parse url="app=core&module=search&do=viewNewContent&search_app=<if test="viewnewcontentapp:|:$this->registry->getCurrentApplication() != 'core' AND IPSLib::appIsSearchable( $this->registry->getCurrentApplication() )">{$this->registry->getCurrentApplication()}<else />forums</if>" base="public"}' accesskey='2' title='{$this->lang->words['view_new_posts']}'>{$this->lang->words['view_new_posts']}</a>
                       </li>
                       <if test="showhomeurl:|:$this->settings['home_url'] AND $this->settings['home_name']">
                           <li id='nav_home' class='left'><a href='{$this->settings['home_url']}' title='{$this->lang->words['homepage_title']}' rel="home">{$this->settings['home_name']}</a></li>
                       </if>
                       <if test="hasCustomPrimaryNavigation:|:!empty($header_items['primary_navigation_menu'])">
                           {$header_items['primary_navigation_menu']}
                       <else />
                           <if test="applicationsloop:|:is_array($header_items['applications']) AND count($header_items['applications'])">
                               <foreach loop="applications:$header_items['applications'] as $data">
                                   <if test="showingapp:|:$data['app_show']">
                                       {parse variable="appActive" default="" oncondition="$data['app_active']" value="active"}
                                       <li id='nav_app_{$data['app_dir']}' class="left {parse variable="appActive"}"><a href='{parse url="{$data['app_link']}" seotitle="{$data['app_seotitle']}" template="{$data['app_template']}" base="{$data['app_base']}"}' title='{parse expression="sprintf( $this->lang->words['go_to_prefix'], IPSLib::getAppTitle($data['app_dir']) )"}'>{IPSLib::getAppTitle($data['app_dir'])}</a></li>
                                   </if>
                               </foreach>
                           </if>
                       </if>
                       <li id='nav_other_apps' style='display: none'>
                           <a href='#' class='ipbmenu' id='more_apps'>{$this->lang->words['more_apps']} <img src='{$this->settings['img_url']}/useropts_arrow.png' /></a>
                       </li>
                   </ul>
           </div>