Ilya Korablev

if(!$_SERVER['HTTP_REFERER'] == 'YourFrameURL') {
    // Site is NOT loaded from iframe
    die('Please load this page from YourFrameURL');
}
else {
    // Site IS loaded from iframe: display content
}

img{
filter: blur(6px);
}

*{
margin: 0;
padding: 0;
}