I downloaded the package from the Download page, and according to tutorial, I extracted the contents, opened index.html and tried to copy some components into this file.

Some simple components as buttons are fine, but the larger ones (e.g. side navbar) look half-finished.

Netbeans even reports that a lot of classes used in the html were not found (e.g. .collapsible collapsible-accordion, .search-form, .rotate-icon etc.).

I checked if I have all the CSS and JS files included in the index.html and they are there (including the bootstrap ones), so ...what am I doing wrong? Please help, screenshot bellow ...