How to align text on gr.Textbox()

I want to align text in gr.Textbox() to the center.

How can I do it ?

for example, what I need to add to this code:

import gradio as gr

def display_output():
    return "test"

if __name__ == "__main__":

    with gr.Blocks(theme=gr.themes.Glass()) as demo:

        output = gr.Textbox()
        btn = gr.Button(), inputs=[], outputs=output)

    demo.queue().launch(share=False,  debug=False)