Changing Panels

[VinhPN]

Hi,

Where would I go to modify Kanban panels for my custom entity? I want to have a certain background color for a panel depending on the stage.
So far I have my idea down: Add a class that changes the background color in the css file depending on the stage

However, I do not know which file to place the code in, any ideas?

[VinhPN]

More specifically, where do I place my custom kanban-item view?

My view path:

Espo.define('custom:views/record/kanban-item', 'view', function (Dep) {

    return Dep.extend({

        template: 'record/kanban-item',

and my clientDefs

    "recordViews":{
    "kanban-item": "custom:views/record/kanban-item"