Creating a mobile layout that looks like the landscape version while in portrait

Creating a mobile layout that looks like the landscape version while in
portrait

I'm working on a website for job listings that needs to integrate a widget
from SmartRecruiters and have run into an issue with the mobile layout.
I'm using the viewport tag as <meta name="viewport"
content="width=device-width, initial-scale=1, maximum-scale=1" /> which
works really well for a landscape orientation. The issue is that the
SmartRecruiters table that lists the job openings does not shrink to be
narrow enough when in portrait mode and requires the user to scroll
horizontally.
How can I make the portrait layout zoom out to the same width as the
landscape layout that works really well?
Thank you in advance.