Shortcode with mobile device

Hi Team! Thanks to the author for creating a very cool plugin, I am lucky to have found it.

I installed plugin for my website, I just used shortcode to display Next/Prev post link below post content, it displayed fine on desktop browser, but on mobile device with small browser otherwise it does not display well. The “Next Post” section overflows to the right instead of appearing below with a newline.

My site (problem): https://reponseccna.com/question/a-dhcp-configured-pc-boots-up-what-is-the-order-of-the-messages-that-are-sent-and-received-by-this-pc-in-order-to-obtain-an-appropriate-ip-address

Can you help me fix the Next/Pre post section like this:
https://themes.tielabs.com/sahifa/2015/01/26/top-search-engine-optimization-strategies-explained/

Thanks Team!

The page I need help with: [log in to see the link]