JSFiddle - React, Tailwind, and code Playground
HTML
<a onclick="$('.popup').show();return false;">Como Usar</a>
<br>
<div class="popup">
<input type="text" name="t1" value="foo"></input>
<input type="text" name="t2" value="bar"></input> <a onclick="$('.popup').hide();return false;">X</a>
<br>
</div>
<input type="text" name="outside" value="baz"></input>
<br />
<br />
<br />
CSS
.popup {
background-color: #ccc;
padding:5pt;
display:none;
}