Color of Chat Inlay Button

Summary:

Content (required):

I am trying to  change the color of the chat inlay button using "data-oit-theme-vars": {"brandColor": "#65a11b "}. I have no color theme selected in the inlay rule in engagement engine. Below is my inlay config code. The button keep display as the default blue instead of the green I am looking for.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):

{

 "inlays": {

  "types": {

    "inlay-oracle-chat-embedded": {

    "attributes": { 

     "launch-form-fields": ["FIRST_NAME*", "LAST_NAME*", "EMAIL*", "SUBJECT*", {"name": "c$pro_chat_page", "value": "1140", "hidden": "true"}],

     "data-oit-theme-vars": {"brandColor": "#65a11b "}

     },

      "strings": {