responsive css file

Hi
This is the first time I’ve used a forum. Hoping someone can help.

I’ve a wordpress site done using the theme engrave lite which is suppose to be responsive for tablets/phones etc. But the responsive side of it isn’t working. I created the website in a place on my hosting package temporarily while I was working on it and when I moved it to go live the responsive design doesn’t work.

I can see that there is a stylesheet called responsive-style.css and that the details of it are in the functions.php file so it should be called.

Does anyone have any idea how I would get it to work again. I’m at a loss, I tried to copy some of the media queries into my main style sheet to see if it did anything but that didn’t appear to work either…

Thanks