How to change close button color and caption in inAppbrowser

ionic-v1
1 
home.ts code
import { Component } from '@angular/core';
import { InAppBrowser , InAppBrowserOptions } from '@ionic-native/in-app-browser';

@Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage {
options : InAppBrowserOptions = {
    location : 'yes',//Or 'no' 
    hidden : 'no', //Or  'yes'
    clearcache : 'yes',
    clearsessioncache : 'yes',
    hideurlbar : 'yes',
    hidenavigationbuttons :	'yes',
    //zoom : 'yes',//Android only ,shows browser zoom controls 
    hardwareback : 'yes',
    mediaPlaybackRequiresUserAction : 'no',
    shouldPauseOnSuspend : 'no', //Android only 
   
};
constructor(private theInAppBrowser: InAppBrowser) {

}
// public openWithSystemBrowser(url : string){
//     let target = "_system";
    
//     this.theInAppBrowser.create(url,target,this.options);
// }
// public openWithInAppBrowser(url : string){
//     let target = "_blank";
//     this.theInAppBrowser.create(url,target,this.options);
// }
public openWithCordovaBrowser(url : string){
    let target = "_self";
    this.theInAppBrowser.create(url,target,this.options);
}  

}

//home.html code
<ion-header>
  <ion-navbar>
    <ion-title>
      EAZY SCHOOLS
    </ion-title>
  </ion-navbar>
</ion-header>

<ion-content padding>

  <button ion-button (click)="openWithCordovaBrowser('https://www.google.com')">Open with System browser</button>
  <button ion-button (click)="openWithCordovaBrowser('https://www.youtube.com')">Open with In App browser</button>
  <button ion-button (click)="openWithCordovaBrowser('https://www.facebook.com')">Open with Cordova browser</button>

</ion-content>