JSFiddle - React, Tailwind, and code Playground

HTML

Scroll the list below and <a href="#">Click here to toggle</a>
sss

<ul></ul>

CSS

ul{
    height: 161px;
    overflow: auto;
    border: 5px solid rgba(0, 0, 0, 0.5);
    padding: 0px;
    -moz-border-radius: 5px;
    border-radius: 5px;
    width: 260px;
    background: #FFFFFF;
    -webkit-box-shadow: 0px 2px 3px rgba(0, 0, 0, 0.2);
    -moz-box-shadow: 0px 2px 3px rgba(0, 0, 0, 0.2);
    box-shadow: 0px 2px 3px rgba(0, 0, 0, 0.2);
    margin-top: 20px;
}

JavaScript

$('a').click(function(){
    $('ul').fadeToggle();
});

for(i=1; i<=30; i++){
    $('ul').append('<li>List ' + i + '</li>');
}