Just enabled Bootstrap for the advanced forum search page (desktop view):
https://www.unix.com/search.php
That' page still needs work, and to be converted from <table> elements to <div> elements, and to be redesigned, but in the meantime, it's OK using Bootstrap CSS.
Note: Before, we had temporarily required guests to login to use the advanced search function because this page was "under revision" but now that the page is "OK" (first step of renovation, this update), I have opened the page up to all users (guests and members). If the advanced search page starts to get hammered with search bots again, I'll restrict the advanced search page to registered users (again).