JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML>
<html>
<head>
    <title>sol3</title>
    <style type="text/css">
    *
    {
        margin: 0;
        padding: 0;
        border: 0;
    }
    body
    {
        width: 100%;
        height: 100%;
    }
    .fixForIe
    {
        overflow: hidden;
        border-radius: 10px;
        min-width: 200px;
        min-height: 100px;
        margin: 50px 100px;
    }
    .classD
    {
        position: relative;
        border: 2px solid #004c3b;
        min-width: 200px;
        min-height: 100px;
        padding: 8px 10px 8px 8px;
        border-radius: 10px;
        background-image: -o-linear-gradient(bottom, rgba(8, 69, 46, 0.5), rgba(0, 213, 167, 0.5));
        background-image: -moz-linear-gradient(bottom, rgba(8, 69, 46, 0.5), rgba(0, 213, 167, 0.5));
        background-image: -webkit-linear-gradient(bottom, rgba(8, 69, 46, 0.5), rgba(0, 213, 167, 0.5));
        filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#aa7FE7D0', endColorstr='#aa83A498',GradientType=0 );
    }
    .classD div
    {
        width: 100%;
        min-height: 100px;
        border: 1px solid #444;
        background: #fff;
        border-radius: 10px;
        overflow: hidden
    }
    .classD div h3
    {
        display: block;
        border-radius: 10px 10px 0 0;
        width: 100%;
        height: 25px;
        margin-bottom: 10px;
        position: relative;
        background: -o-linear-gradient(bottom, #FFBD00 , #FFD800) ;
        background: -moz-linear-gradient(bottom, #FFBD00 , #FFD800) ;
        background: -webkit-linear-gradient(bottom, #FFBD00 , #FFD800) ;
        filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#FFD800', endColorstr='#FFBD00',GradientType=0 );
    
    }
    .classD div h3::before
    {
        content: "";
        position: absolute;
        bottom: -20px;
        border: 10px solid;
        left: 6px;
        border-color: #FFBA00 transparent transparent;
    }
    .classD div span
    {
       ...