dolibarr/htdocs/modulebuilder/template/css/mymodule.css.php

<?php
/* Copyright (C) ---Put here your own copyright and developer email---
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

/**
 * \file    htdocs/modulebuilder/template/css/mymodule.css.php
 * \ingroup mymodule
 * \brief   CSS file for module MyModule.
 */

//if (! defined('NOREQUIREUSER')) define('NOREQUIREUSER','1');	// Not disabled because need to load personalized language
//if (! defined('NOREQUIREDB'))   define('NOREQUIREDB','1');	// Not disabled. Language code is found on url.
if (! defined('NOREQUIRESOC'))    define('NOREQUIRESOC', '1');
//if (! defined('NOREQUIRETRAN')) define('NOREQUIRETRAN','1');	// Not disabled because need to do translations
if (! defined('NOCSRFCHECK'))     define('NOCSRFCHECK', 1);
if (! defined('NOTOKENRENEWAL'))  define('NOTOKENRENEWAL', 1);
if (! defined('NOLOGIN'))         define('NOLOGIN', 1);          // File must be accessed by logon page so without login
//if (! defined('NOREQUIREMENU'))   define('NOREQUIREMENU',1);  // We need top menu content
if (! defined('NOREQUIREHTML'))   define('NOREQUIREHTML', 1);
if (! defined('NOREQUIREAJAX'))   define('NOREQUIREAJAX', '1');

// Load Dolibarr environment
$res=0;
// Try main.inc.php into web root known defined into CONTEXT_DOCUMENT_ROOT (not always defined)
if (! $res && ! empty($_SERVER["CONTEXT_DOCUMENT_ROOT"])) $res=@include $_SERVER["CONTEXT_DOCUMENT_ROOT"]."/main.inc.php";
// Try main.inc.php into web root detected using web root calculated from SCRIPT_FILENAME
$tmp=empty($_SERVER['SCRIPT_FILENAME'])?'':$_SERVER['SCRIPT_FILENAME'];$tmp2=realpath(__FILE__); $i=strlen($tmp)-1; $j=strlen($tmp2)-1;
while($i > 0 && $j > 0 && isset($tmp[$i]) && isset($tmp2[$j]) && $tmp[$i]==$tmp2[$j]) { $i--; $j--; }
if (! $res && $i > 0 && file_exists(substr($tmp, 0, ($i+1))."/main.inc.php")) $res=@include substr($tmp, 0, ($i+1))."/main.inc.php";
if (! $res && $i > 0 && file_exists(substr($tmp, 0, ($i+1))."/../main.inc.php")) $res=@include substr($tmp, 0, ($i+1))."/../main.inc.php";
// Try main.inc.php using relative path
if (! $res && file_exists("../../main.inc.php")) $res=@include "../../main.inc.php";
if (! $res && file_exists("../../../main.inc.php")) $res=@include "../../../main.inc.php";
if (! $res) die("Include of main fails");

require_once DOL_DOCUMENT_ROOT.'/core/lib/functions2.lib.php';

session_cache_limiter('public');
// false or '' = keep cache instruction added by server
// 'public'  = remove cache instruction added by server and if no cache-control added later, a default cache delay (10800) will be added by PHP.

// Load user to have $user->conf loaded (not done by default here because of NOLOGIN constant defined) and load permission if we need to use them in CSS
/*if (empty($user->id) && ! empty($_SESSION['dol_login']))
{
    $user->fetch('',$_SESSION['dol_login']);
	$user->getrights();
}*/


// Define css type
header('Content-type: text/css');
// Important: Following code is to cache this file to avoid page request by browser at each Dolibarr page access.
// You can use CTRL+F5 to refresh your browser cache.
if (empty($dolibarr_nocache)) header('Cache-Control: max-age=10800, public, must-revalidate');
else header('Cache-Control: no-cache');

?>

div.mainmenu.mymodule::before {
    content: "\f249";
}
div.mainmenu.mymodule {
    background-image: none;
}

.myclasscss {
	/* ... */
}