How to assign css to a module controller .tpl?

[JoelWebsites]

How to assign css to a module controller 

 

in my main module file 

I have added $this->registerHook('header') &&

 

public function hookHeader()

{

$this->context->controller->addJS($this->_path.'/js/front.js');

$this->context->controller->addCSS($this->_path.'/css/my-account.css');

}

 

but still cannot see the css being used in module controller that has assigned a tpl

 

How do I get this done?..thanks

[JoelWebsites]

silly me ...I had not put proper css code