How to make web app on small devices look like on desktop

I have an web application made with Bootstrap & Angular. When I access it on my smartphone, it applies queries correctly. But some pieces of application are too big for smartphone (especially tables). And then, I had a look at strava.com on my smartphone, and for instance their page renders the same on smartphone as on big devices. What technique they are using? Anyway, I was thinking about applying css zoom property to some pieces of the page (or set constant widths of body, but it did not help), but I'm not sure if this is correct way to go. Could you advice?