public function get_inline_css($group_name = false)
{
$value = false;
if ($group_name !== false && isset($this->inline_css_groups[$group_name])) {
$value = $this->inline_css_groups[$group_name];
} else {
if (!empty($this->inline_css)) {
$value = $this->inline_css;
}
}
return $value;
}