JSFiddle - React, Tailwind, and code Playground

HTML

<div id="outside">
    <div id="inside">
    </div>
</div>

CSS

#outside {
width:400px;
height:150px;
border-style:dashed; border-width:3px;
position: relative; 
}
#inside {
background-color: white;
width:404px;
height:154px;
position: absolute;
top:-2px;
left:-2px;
}