JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css">
<button class="btn btn-link p-0" id="my-button">
  <div id="nested-div"></div>
 </button>

CSS

body {
    margin: 10px;
}

#my-button {
  width: 100px;
  height: 100px;
}

#nested-div {
  display:inline-block;
  background-color:#c2f5ff;
  width: 100%;
  height: 100%;
}