How do I Remove author box in simply vision?

You will probably need to start customising your theme’s CSS via a child theme or a custom CSS plugin.

Yes, I tried some CSS customizations but none of them seem to work. Can you show me the right ones?

Thank you for the response.

Try using Firefox with the Firebug add-on for this kind of CSS troubleshooting. Or use whatever developer tool is available in your web browser.

I was finally abble to remove the author box using
.author-info {
display: none;
}

I still need the right code to center the title.

Thank you.