Currently, they're done with a 3 column table. Should be redone using divs or something.
As an example:
https://en.m.wikipedia.org/wiki/Category:All_articles_with_dead_external_links there is a 3 column table.
Switch the table into responsive HTML which appears as a single column list on mobile (around 320px resolution). At 768px it should restore to a three column list.
This resource may help: