Html codes in different parts of the website

function render_page() {
?>
html code here.
<?php
echo CONTENT; // this is the CMS output.
}

if (!defined('IN_FUSION')) {
 die('Access Denied');
}

require_once INCLUDES.'theme_functions_include.php';
require_once 'theme_autoloader.php';

define('THEME_BULLET', '·');
define('BOOTSTRAP', TRUE);
define('FONTAWESOME', TRUE);

if (!defined('ATOM9_LOCALE')) {
 if (file_exists(THEME.'locale/'.LANGUAGE.'.php')) {
 define('ATOM9_LOCALE', THEME.'locale/'.LANGUAGE.'.php');
 } else {
 define('ATOM9_LOCALE', THEME.'locale/English.php');
 }
}

function render_page(){
 Atom9Theme\Producer::GetInstance()->render_page();
}

function opentable($title = '', $class = '') {
 echo '<div class="mainpanel '.$class.'">';
 echo $title ? '<div class="heading">'.$title.'</div>' : '';
 echo '<div class="body">';
}

function closetable() {
 echo '</div>';
 echo '</div>';
}

function openside($title = '') {
 echo '<div class="sidepanel">';
 echo $title ? '<div class="heading">'.$title.'</div>' : '';
 echo '<div class="body">';
}

function closeside() {
 echo '</div>';
 echo '</div>';
}

$theme_settings = get_theme_settings('Atom9');
$ignition_pack = !empty($theme_settings['ignition_pack']) ? $theme_settings['ignition_pack'] : 'DefaultPack';
define('IGNITION_PACK', THEME.'IgnitionPacks/'.$ignition_pack.'/');

Atom9Theme\Core::GetInstance()->GetIgnitionPacks($ignition_pack);