Issue with mobile version

Hi we have installed the Hot restaurant template.
However, the mobile version doesn't look good and doesn't resize on mobile.
Both iphone and Ipad..

we're created a menu etc...
The image of the slideshow don't re-size automatically on mobile.
Actually no image re-size.

Here is the URL.
terrasse-de-paris.jp

I'm happy to pay some maintenance/support fees as I'm not very tech savy.
We need help.

Please let me know what we can do so that our client can use the website on mobile version.

Thanks.

You need also to optimize content you put in modules so it look ok when module position is resided.