JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" title="">asdasasd</a>

CSS

a {
    display:inline-block;
    padding:5px 20px;
    position:relative;
    text-decoration:none;
    background-color:green;
    border: 1px solid green;
    border-radius:5px;
}
a:after {
    display:block;    
    content:"";    
    position:absolute;
    bottom:-1px;
    right:-1px;
    border: none;
    border-bottom: 15px solid #FFF;
    border-left: 15px solid transparent;
}