Insert exposed filter block in center of navigation menu

I've tried to inject via css module, code that would display a single-line block in the center of my navigation bar. I currently have a primary and secondary menu on that bar. See screenshot.

I have a views filter exposed in a block. I'm trying to get that block to show in the center of my navigation. I am looking for code that will either allow me to inject the block in the navigation bar or inject the views exposed form itself there. Either will work.

I'm exhausted with options. I tried this code but did not get anywhere;

#navigation #block-views-exposed-form-Donations-and-requests-pages-and-lists-page-1 {
  margin: 0;
  padding: 0px;
  float: center;
}