I want to know how i can reduce the height of the top panel, i've search on google but i cant`t find an answer. Thanks!
You can make the panel shorter by editing your system's stylesheet. If you haven't modified your system, the file you want to edit is
/usr/share/themes/elementary/gtk-3.0/apps.css. You can adjust the height of the panel by reducing the padding in the selector
.composited-indicator. The current version of the stylesheet doesn't style
.composited-indicator directly, so you'll have to add a line for it.
.composited-indicator is a Gtk.MenuItem so it inherits all the style properties defined in
/usr/share/themes/elementary/gtk-3.0/gtk-widgets.css under the selector