So this is my test site: http://www.manukarki.com
It is responsive for desktop resizing and online mobile emulations like mobiletest.me but for the real device(my moto G 1st gen) it's not working. Currently the media query for this is
@media only screen and (max-width: 640px)
You need to add a viewport meta tag to the
<head> of your page.
<meta name="viewport" content="width=device-width, initial-scale=1">
You can read more on the mozilla developer network