Centering links in menu Options

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Hi guys,
I'm trying to implement some code I found on w3schools for a responsive menu.

This is the code: https://www.w3schools.com/howto/howto_js_to..._responsive.asp

It appears to work well, but the problem I'm having, is that I can't get the links to be centered across the page.
I've tried removing the float: left / adding divs inside divs with percentages / margin: 0 auto, etc. etc., but I'm getting nowhere.

I wonder if someone could help me sort out this problem?

They have a sort of jsfidddle type page here: https://www.w3schools.com/howto/tryit.asp?f...ryhow_js_topnav

Many thanks.

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This was the fix...

CODE

@media screen and (max-width: 600px) {
    .topnav a:not(:first-child) {
        display: none;
    }
    .topnav a {
        float:left;
    }    
    .topnav a.icon {
        float: right;
        display: block;
    }
}