JSFiddle - React, Tailwind, and code Playground

by batcave

HTML

<div class="toolTip"></div>

CSS

body {
  background-color: #dcdcdc;
}

.toolTip {
  position: absolute;
  background: #fff;
  width: 100px;
  height: 100px;
  top: 50px;
  left: 50px;
  filter: drop-shadow(2px 2px 6px rgba(0, 0, 0, .1));
}

.toolTip:after {
  content: " ";
  position: absolute;
  top: -15px;
  right: 20px;
  width: 0;
  height: 0;
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
  border-bottom: 15px solid white;
}