app.component.mv3.ts

export class AppComponent implements OnInit {
  color = '#ffffff';

  public colorize() {
    chrome.tabs.query({ active: true, currentWindow: true }, tabs => {
      chrome.scripting.executeScript({
        target: { tabId: tabs[0].id! },
        func: updateBackgroundColor,
        args: [this.color]
      });
    });
  }
}

const updateBackgroundColor = (color: string) => document.body.style.backgroundColor = color;