You have several options available from the administration console, you must have the administrator role.

From the configuration option, appearance section.

You can also edit using CSS at two different points in the configuration and it is always advisable for people with knowledge of HTML and CSS editing to manage this:

  • Settings -> Appearance -> Organization Colors -> Custom Header Code -> Complex option and for people with knowledge of HTML + CSS editing.

Appearance settings

Code example

  • Settings -> Awesome -> Custom Styles -> Style Modifications -> Even more complex option and also for people with knowledge of HTML + CSS editing.

Style settings