Tiki uses the Smarty template engine, so pages generally have a PHP file (.php) and a Smarty template (.tpl) associated with them. These produce the XHTML for the page, which is then given visual styles with CSS. The CSS is provided by a combination of some feature-specific stylesheets, default layout and design stylesheets, and theme stylesheets.
luci, 09:13 GMT, Mon 09 of Dec, 2013: logo updated with ®. please do ctrl+F5 refresh...
chibaguy, 06:31 GMT, Thu 16 of May, 2013: Veronica, that star has been eclipsed many times, with Tiki 11.o now soon to rise. ;-)
veronicamarsh, 08:33 GMT, Sun 12 of May, 2013: tikiwiki 2.0 is the star of this weekend. Just follow as we add it to SM dev.
chibaguy, 02:57 GMT, Thu 04 of Oct, 2012: This is a late reply, but, for the record, the Milkyway theme (following the original design) doesn't have a search form in the top bar. You can put one at the top of a side column, etc. instead.
andi6803, 12:20 GMT, Tue 18 of Oct, 2011: I use tiki 6v4 with the Milkyway theme. But it's not possible to switch on the search bar at the top bar. With other themes it works.