Hi,
I saw the landing page of your website. here is what is see in inspect element -
You are not using bootstrap because there are no bootstrap css files OR CDN included in the head section of your html page. Also i don't see any media queries of 480px for mobile as well to handle the responsive design to be mobile friendly.
If you want to make it mobile friendly then add media queries for that. This stack overflow thread will help stackoverflow.com/questions/6370690/media-queries…
Thanks