JSFiddle - React, Tailwind, and code Playground

HTML

<div class="arrow-up"></div>
<div class="arrow-down"></div>
<div class="arrow-left"></div>
<div class="arrow-right"></div>

CSS

.arrow-up {
	width: 0; 
	height: 0; 
	border-left: 5px solid transparent;
	border-right: 5px solid transparent;
	
	border-bottom: 5px inset black;
}

.arrow-down {
	width: 0; 
	height: 0; 
	border-left: 20px solid transparent;
	border-right: 20px solid transparent;
	
	border-top: 20px inset #f00;
}

.arrow-right {
	width: 0; 
	height: 0;
    border: 60px solid transparent;
	/*border-top: 60px solid transparent;
	border-bottom: 60px solid transparent;*/
	border-left-style: inset green;
}

.arrow-left {
	width: 0; 
	height: 0; 
	border-top: 10px solid transparent;
	border-bottom: 10px solid transparent; 
	
	border-right:10px inset blue; 
}