[DUPLICATE POST, LOCKED] Bootstrap tab pane content moves down the page...

Hi wonderful people,

After making my pages all php in order to link up with a template, the tab panes are not working properly - content in each subsequent pane moves down the page even further than the last

https://www.quodvultdeus.com/KS3_Philo.php

There is nothing additional in the css apart from the default settings - margin (auto) and padding (3em) for each pane.