JSFiddle - React, Tailwind, and code Playground

HTML

<button onclick="dropDown()">Show options</button>
<ul id="dropdown">
    <li><a href="google.com">Option 1</a></li>
    <li><a href="google.com">Option 2</a></li>
    <li><a href="google.com">Option 3</a></li>
    <li><a href="google.com">Option 4</a></li>
</ul>

CSS

#dropdown{
    
}
#dropdown * {

}

JavaScript

var x = 0;

function dropDown(){
    if(x == 0){
        document.getElementById("dropdown").style.display="none";
        x = 1;
    }else{
        document.getElementById("dropdown").style.display="block";
        x = 0;
    }
}