Moodle: custom CSS in Essential theme

When you want to custom a moodle instance, you could need to modify Essential theme, for example, I don't want to see headers in SCORM content. The best option is use customcss property.

We go to admin/settings.php?section=theme_essential_generic in our site and we search for customcss textarea. To avoid seeing headers in SCORM, we add:

#page-mod-scorm-player div[role=main] h2 {display: none;}
#page-mod-scorm-player header[role=banner] {display: none;}

Best regards!