JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper"><div class="downArror"></div></div>

CSS

.wrapper{
    
    background-color:black;
    width:100px;
    height:100px;
}
.downArror{

	float: left;
	display: inline-block;
	border: 15px solid rgba(0, 0, 0, 0);
	border-bottom-color: #fff;
	margin: 8px;

}