Adding font color in CkEditor5 react js

I am using CKeditor5 with Classic Editor and upload plugin in reactJs. I want to add font color functionality in text editor. As per documentation I've tried to install and use @ckeditor/ckeditor5-font, but it is giving me error of "ckeditor-duplicated-modules". How to add font color in the text editor?

import { CKEditor } from "@ckeditor/ckeditor5-react";
import ClassicEditor from "@ckeditor/ckeditor5-build-classic";

<CKEditor
                    config={{
                      extraPlugins: [uploadPlugin],
                    }}
                    editor={ClassicEditor}
         开发者_运维问答           data={value}
                    // onInit={(editor) => {}}
                    onReady={(editor) => {}}
                    onChange={this.handleCk5change}
                    className="ckeditor-custom"
                  />

You can create a css file and set the color property for the .ck.ck-content class like this:

.ck.ck-content{
    color: red !important;
}