centered logo

hello!
sorry for the silly question!
I would like to set a .png logo on this manteinance page http://dariomoroldo.com/, in the same position (and width) of the actual text.the goal is to remove the text and to have only the logo. when I upload the png, this is set by default at the top page.how can I change this? in the meantime that I will wait for your feedback i will study some css 🙂
thanks guys!

https://wordpress.org/plugins/maintenance/