JSFiddle - React, Tailwind, and code Playground

HTML

<div class='bundar'></div>
<div id='bundar'></div>

CSS

.kotak{
    width:50px;
    height:50px;
    background:black;
}
#bundar{
    width:50px;
    height:50px;
    background:black;
    border-radius:50%;
}