Gradients are similar to the color variables. Define as many gradients as you want and use them throughout the admin in the Background editor. See example
Gradients can only be used as backgrounds and will be found throughout the admin wherever there is a background editor available. There are several 3rd party gradient generators on the web. Simply copy/paste the gradient code in the provided code box.
The recommended syntax for gradients is
background-image. So if you copy a generated code that uses only
background make sure to change the properly to