JSFiddle - React, Tailwind, and code Playground

HTML

<fieldset style="top: 10px;">
    <div></div>
</fieldset>
<fieldset style="top: 130px;">
    <legend>legend</legend>
    <div></div>
</fieldset>

CSS

div {
    position: absolute;
    border: 1px dashed red;
    top: 0;
    left: 0;
    margin: 0;
    width: 100px;
    height: 100px;
}

fieldset {
    position: absolute;
    border: 1px green solid;
    width: 100px;
    height: 100px;
    padding: 0;
}