How to center logo across top of header

Do you have a section of the dashboard named, “Custom CSS”?

Not that I can find. I have Admin CSS and Edit CSS.

In your Edit CSS section, enter this;

#logo {
 margin: 15px auto;
}

Thank you. Now, if I decide I DON’T like that and want to change it back, what do I enter?
?? Sally

Remove what you have entered.

I should have viewed preview first, but did not. Now, I’d like to change it back to the way it was. How can I do that?
Thank you

Take this away;

#logo {
 margin: 15px auto;
}

Well, of course. Embarrassed. Thank you.