How do I bring "Choose File " in the center of the page

[SadafShafi]

As you can see from the picture, as I click on gallery button the choose file icon comes on the top, how do I change that?

Here is my code:

AccessGallery(){

    this.camera.getPicture({
   
       sourceType: this.camera.PictureSourceType.SAVEDPHOTOALBUM,
   
       destinationType: this.camera.DestinationType.DATA_URL
   
      }).then((imageData) => {
   
        var base64Image = `data:image/jpeg;base64,`+imageData;
   
        this.picture = base64Image;
   
           }, (err) => {
   
        console.log(err);
   
      });
   
   }