Newsletter widget area does not appear on mobile

Newsletter widget does not show up on mobile
check this - https://demo.gavick.com/wordpress/technews/
if i minimize it to check responsiveness, newsletter widget disappears.
i tries this on my website also. same result.
how to keep this on mobile also?

And also, it does not close even though I click on close button/ cross. see http://simranlaw.com/

Sorry for three posts, but i post only when I see additional problem. Now the same newsletter shows on 1920x1080 only. Not visible on 1280x720. Visible only on 1400x1050 and above. Please solve the issue

Hi,

Could you please provide me with a URL to your website and back-end access via PM (click the “Private Message” text underneath my avatar) so that I may analyze it?

You didn't add Newsletter widget to Newsletter widget area. Please check the documentation first:
https://www.gavick.com/wordpress-themes ... al-widgets

Hi. I did read the documentation. and i tried the css changes after using newsletter widget. I was able to change css to show the widget. But the problem again arose that the widget display in mobile view hindered visibility of my mobile calling plugin. So i decided not to use this. Instead i am using another plugin now instead of newsletter widget. Thanks for help again. But I am sure the widget is not visible in mobile view if we do not change CSS.
Regards