UI changes - how to change style of user background

Hi,

Introduction:
First of all, we are using docker version of jitsi, so how we do UI style changes? In general we created external custom-all.css at default config path and use it via docker volume. In other words, we overwrite the original file with ours. Thus, we do not have to create our own docker containers.

volumes:
    - ${CONFIG}/web/custom-all.css:/usr/share/jitsi-meet/css/all.css:Z

Question:
We can’t find the right style which will manipulate the:

thank you in advance for your help

DYNAMIC_BRANDING_URL

here we found what we needed for example:

"customTheme": {
    "palette": {
      "ui01": "orange !important",
      "ui02": "maroon",
      "surface02": "darkgreen",
      "ui03": "violet",
      "ui04": "magenta",
      "ui05": "blueviolet",
      "field02Hover": "red",
      "action01": "green",
      "action01Hover": "lightgreen",
      "disabled01": "beige",
      "success02": "cadetblue",
      "action02Hover": "aliceblue"
    }
  }