Center Logo and Menu Buttons

Hey I wanted to center my Logo and wanted to put the menu buttons underneath centered under the logo. Here is a link to my site https://smiles4miles.us/

I am new to wordpress but am slowly figuring things out. I have a child theme and also have a child version of functions.php. I followed the steps in this snippet https://www.themesandco.com/snippet/center-header-block-items/ but still have not had any luck

?? Any help would be greatly appreciated