JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
          <div class="blok">
              <span></span>
          </div>
</div>

CSS

.wrap{
margin:20px auto;
width:600px;
background:#e7e7e7;
padding:20px 0px;    
}

.blok{
margin:0 auto;
width:200px;
height:200px;
background:#e7e7e7;
border:1px solid #ccc;
}

span{
display:block;
width:198px;
height:198px;
border:1px solid #fff;    
}