JSFiddle - React, Tailwind, and code Playground

HTML

<a href = "#"><div id = "menu" onclick="menu()">
            <div id = "line1">1</div>
            <div id = "line2">1</div>
            <div id = "line3">1</div>
        </div></a>

JavaScript

document.getElementById('line1').style.opacity = "0";