Reserved for experts, this page allows adding CSS or JS scripts in addition in Jeedom, which will be run on each page.
Accessible by Administration → Advanced customization
You can therefore from this page add JS and CSS scripts executed everywhere in Jeedom, distinguishing the desktop version from the mobile version.
For unsophisticated people who want to discover CSS http://css.mammouthland.net/premiers-pas-en-css.php
IMPORTANT
Any error in one of these scripts can make Jeedom totally unavailable and you will have to connect via SSH and delete the customization files to be able to recover it