JSFiddle - React, Tailwind, and code Playground

HTML

<span></span>

CSS

span {
      border-top: 50px solid transparent;
  border-bottom: 50px solid transparent;
  transform: scale(0.99999);
  border-left: 30px solid black;
  position: absolute;
  margin-top: -20px;
  margin-left: -15px;
}
span::before {
  content: '';
  border-top: 50px solid transparent;
  border-bottom: 50px solid transparent;
  border-left: 30px solid black;
  position: absolute;
  top: 50%;
  margin-top: -50px;
  margin-left: -33px;
}