How to solve the issue with bootstrap working on devices with a screen less than 980 pixels?

Question

css

Good afternoon.
I don’t know how to cure it: on mobile devices, for example on a phone, the site shrinks only to 980 pixels (tablet version). At the same time, when resizing the browser window on the computer, everything works well. Tell me, please, what can be done?
Working version of the site: docer.help

Answer 1

add to head

<meta name="viewport" content="width=device-width, initial-scale=1.0">