Hi,
I have added folders in my module views/css and inside module php wrote below code.
$this->context->controller->addCSS($this->_path.'views/css/cssfilename.css');
This includes css file when I load my module in front-office.
Another way to do it like below function in module php file.
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public function hookHeader ($ params) { $this->context->controller->addJS($this->_path.'views/js/jsfilename.js'); $this->context->controller->addCSS($this->_path.'views/css/cssfilename.css'); }