JSFiddle - React, Tailwind, and code Playground

HTML

<div class="box">
    
    <div class="triangle"></div>
    <div class="base">Deadpool</div>

</div>

CSS

.box {
    position:relative;
    width:250px;
    height:150px;
    background-color:#ccc;   
}
.base {
    display: inline-block;
    position: absolute;
    bottom: 5px;
    right: -8px;
    background-color: #ffcc00;
    color: #5A5A5A;
    font-size: 12px;
    font-weight: bold;
    padding: 2px 5px;
    text-decoration: none;
    margin:0;
}
.triangle {
    width: 0px;
    height: 0px;
    border-style: solid;
    border-width: 10px 0 0 11px;
    border-color: transparent transparent transparent #DBB004;
    display: inline-block;
    position: absolute;
    bottom: 24px;
    right: -8px;
    margin:0;
    z-index: -1;
}