I added contact us page and about us page which are working perfectly fine on my destop but are blank when i see my website on mobile
Hello !
It looks like you are using Mobile theme.
The Mobile theme was specially designed for optimization on mobile devices. Unfortunately on mobile theme you cannot do much changes of design. If you want to have the same design as on desktop mode you can achieve that by simply disabling the mobile theme.
You will have to recreate your pages into the Mobile editor or completely disable the mobile theme. The mobile editor will not render shortcodes !
Also you can disable mobile theme on certain pages or posts by following this setting: 
Please take a look here: https://forum.tagdiv.com/the-mobile-theme/
Mobile theme plugin can be disabled from Newspaper Plugins as you can see here: https://www.screencast.com/t/LnkZCEVC
Thank you !
