I follow this post https://www.joomlart.com/forums/d/34347-possibility-for-full-screen-responsive-image-with-no-masthead-header/2 and I modify the file as:
<?php
defined('_JEXEC') or die;
?>
<!DOCTYPE html>
<html lang="<?php echo $this->language; ?>" dir="<?php echo $this->direction; ?>"
class='<jdoc:include type="pageclass" />'>
<head>
<jdoc:include type="head" />
<?php $this->loadBlock('head') ?>
<?php $this->addCss('layouts/docs') ?>
</head>
<body>
<div class="t3-wrapper"> <!-- Need this wrapper for off-canvas menu. Remove if you don't use of-canvas -->
<?php $this->loadBlock('header') ?>
<?php if ($this->getParam('addon_ajax_enabled', 1)): ?>
<div class="load-indicator"><div class="load-indicator-progress"></div></div>
<?php endif ?>
<div class="two-blocks-wrapper <?php if (!$this->getParam('responsive', 1)) echo 'no-responsive container'; ?>">
<div class="block-left col-xs-12 col-lg-3">
<?php $this->loadBlock('block-left', array('AJAX-BLOCK')) ?>
</div>
<div class="block-right col-xs-12 col-lg-9 col-lg-offset-3">
<?php $this->loadBlock('block-right', array('AJAX-BLOCK')) ?>
</div>
<div class="block-footer col-xs-12 col-lg-6 col-lg-offset-6">
<?php $this->loadBlock('footer') ?>
</div>
</div>
</div>
<?php $this->loadBlock('block-invisible', array('AJAX-BLOCK')) ?>
</body>
</html>
now it's not perfect because I see the two part overlap, can you help me to correct?
You can see this template here:http://pirriprova.sviluppo.host/it/interior-design/cucine/liberamente.html
thank you very much