Merhaba
<?php
@session_start();
include 'func/gen_func.php';
include '../server/control.php';
control_user();
loginBAN($uid, $session_agent);
?>
<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="Suck My Dick Bitches!">
<meta name="keywords" content="worlwide,automation">
<meta name="author" content="Dalin">

<title><?php echo $page_title ?> - Dalin</title>
<link href="https://fonts.googleapis.com/css?family=Poppins:400,500,700,800&display=swap" rel="stylesheet">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<link href="../assets/plugins/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<link href="../assets/plugins/font-awesome/css/all.min.css" rel="stylesheet">
<link href="../assets/plugins/perfectscroll/perfect-scrollbar.css" rel="stylesheet">
<link href="../assets/plugins/pace/pace.css" rel="stylesheet">
<?php
foreach ($customCSS as $css) {
echo $css . "n";
} ?>

<link rel="apple-touch-icon" sizes="180x180" href="../assets/icon/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="https://i.hizliresim.com/bgz1mf3.png">
<link rel="icon" type="image/png" sizes="16x16" href="https://i.hizliresim.com/bgz1mf3.png">
<link rel="manifest" href="../assets/icon/site.webmanifest">
<link rel="mask-icon" href="../assets/icon/safari-pinned-tab.svg" color="#5bbad5">
<meta name="msapplication-TileColor" content="#da532c">
<meta name="theme-color" content="#ffffff">

<link href="../assets/css/main.min.css" rel="stylesheet">
<link href="../assets/css/custom.css" rel="stylesheet">
<style>
.wizort-rounded {
border-radius: 25px !important;
}

body{background-image:url(https://images5.alphacoders.com/445/445906.jpg);
background-repeat :no-repeat;
}
</style>
</head>

<body class="<?php if (!empty($body_class)) {
echo $body_class;
} ?>">

Web sitemin header main.php sinde yer alan bu koddaki body background kısmında 5 6 tane farklı tema seçeneği olacak ve kullanıcı 5 6 fotoğraf arasından istediği temayı tek tuşla aktif edip o temayla kullanıcak lütfen bu kodu dediğim şekilde düzenleyip bana atarmısınız acil