JSFiddle - React, Tailwind, and code Playground

HTML

<link id="style1" rel="stylesheet" type="text/css" href="resumecss.css" />
<button type="button" onclick="toggle()">Switch</button>

JavaScript

function toggle() {
    var el = document.getElementById("style1");
    if (el.href.match("resumecss.css")) {
        el.href = "resumecssinvert.css";    
    }
    else {
        el.href = "resumecss.css";  
    }

}