code: public function updateStyleSheet($intId)
  	{
  		$objStyleSheet = $this->Database->prepare("SELECT * FROM tl_style_sheet WHERE id=?")
  										->limit(1)
  										->execute($intId);
  
  		if ($objStyleSheet->numRows < 1)
  		{
  			return;
  		}
  
  		// Delete the CSS file
  		if (Input::get('act') == 'delete')
  		{
  			$this->import(Files::class, 'Files');
  			$this->Files->delete('assets/css/' . $objStyleSheet->name . '.css');
  		}
  
  		// Update the CSS file
  		else
  		{
  			$this->writeStyleSheet($objStyleSheet->row());
  			$this->log('Generated style sheet "' . $objStyleSheet->name . '.css"', __METHOD__, TL_CRON);
  		}
  	}
docs: Update a particular style sheet
  
  @param integer $intId