Inline style attribute will be removed by CodeIgniter by default, not tinymce’s fault!

Set this param to false in config.php:

$config['global_xss_filtering'] = false;

Reference:

• http://stackoverflow.com/questions/3899777/codeigniter-global-xss-filtering
• http://forum.codeigniter.com/archive/index.php?thread-1192.html
• https://github.com/bcit-ci/CodeIgniter/issues/1570