I mean, I have removed some of the elements in HTML page and also customized the CSS which were located in the site\target\mycompany\WEB-INF\templates folder and also site\target\mycompany\css folder (style.css).
I might have modified it twice or thrice. It worked for me but until recently. It is not working now, some modifications that I've done just before aren't saved.
They are saved for that particular session only, once after the server is restarted those changes are not taking effect.
Also, I have also replaced some images in the site\mycompany\img folder, but those images are also displayed only for that particular session., later those images are replaced by the default images.