Seeking How To Center The Navigation Links within the Navigation Field Using CSS

Hi!

Attached is an image of the site that I am working on.

I managed to expand the navigation field so it is now flushed up against the logo image. I now would love align the links so they are center within that field

/* Style the links inside the navigation bar */
.topnav a {
  float: center;
  text-align: center !important;
}

What am I missing?

Thank you so much in advance for your help/insight!