JSFiddle - React, Tailwind, and code Playground

HTML

<div class="arrow"></div>

SCSS

.arrow {
  width: 80px;
  height: 2px;
  background-color: red;
  margin: 40px auto;
  position: relative;

  &::before {
    content: '';
    border-right: 2px solid red;
    border-bottom: 2px solid red;
    transform: rotate(45deg) translateX(-50%);
    display: block;
    width: 30px;
    height: 30px;
    position: absolute;
    left: 50%;
    top: -3px;
    background-color: #fff;
  }
}