JSFiddle - React, Tailwind, and code Playground

by Caleb Wong

HTML

<script src="https://raw.github.com/LeaVerou/prefixfree/master/prefixfree.min.js"></script>
<div class="ui-overlay">
    <div class="ui-overlay-content">
        content
    </div>
    <div class="arrow"></div>
</div>

CSS

body {
    padding: 20px;
}
.ui-overlay {
    padding-bottom: 10px;   
    position: relative;

}
.ui-overlay-content { 
    background: #999;
    color: #000;
    padding: 8px;
    border-radius: 4px; 
    border: 5px solid rgba(0, 0, 0, 0.2); 
    background-clip: padding-box; 
    height: 100px;
    width: 200px;
}
.ui-overlay-content:after {
    content: ' ';
    border-width: 12px;
    border-color: #999 transparent transparent;
    border-style: solid;
    bottom: -9px;
    left: 30px;
    width: 0;
    height: 0;
    position: absolute;
}
.arrow {
    bottom: -30px;
    left: 26px;
    width: 40px;
    height: 40px;
    position: absolute;
    overflow: hidden;
}
.arrow:after {
    content: ' ';
    display: block;
    background: red;
    width: 18px;
    height: 18px;
    transform: rotate(45deg);
    position: absolute;
    top: -20px;
    left: 3px;
    background: #999;
    border: 5px solid rgba(0, 0, 0, 0.2);
    background-clip: padding-box;
}