JSFiddle - React, Tailwind, and code Playground

HTML

<div id="talkbubble"></div>

CSS

#talkbubble 
{ 
    width: 100px;
    height: 36px;
    background: #FFCC05;
    position: relative;
    -moz-border-radius:8px 0 0 8px;
    -webkit-border-radius:8px 0 0 8px;
    border-radius:8px 0 0 8px;
    margin-right:50px;

} 

#talkbubble:before
{
    content:"";
    display:block;
    position: absolute;
    right: -36px;
    top:0;
    width: 0;
    height: 0;
    border: 18px solid transparent;
    
    border-color: transparent transparent #FFCC05 #FFCC05;
}