JSFiddle - React, Tailwind, and code Playground

HTML

<div id="pentagram"></div>

CSS

#pentagram {
  position: absolute;
   width: 0; 
   height: 0; 
   border-right: 120px solid transparent; 
   border-left: 120px solid transparent; 
   border-bottom: 80px solid black;
  top:100px;
  left:50px;  
}