Hello @thoughtsociety,
We recommend that you use the Global block for each content of your tab. You can easily assign or align the elements for each column by utilizing the editor. You do not have to manually code the contents of the tab. When you are done or satisfied with your global block and its columns, all you have to insert in the tab is the global block shortcode.
By the way, based from your screenshot, I am seeing <body>
and <html>
tag which is not good. Your html code may have contain invalid tag which could messed the page sooner or later. Please make sure that your html code is valid and correct only.
Hope this make sense.