JSFiddle - React, Tailwind, and code Playground

HTML

<div>Оформить</div>

CSS

div {
  background: tomato;
  padding: 3rem;
  display: inline-flex;
  align-items: center;
  font-size: 2rem;
  color: white;
  position: relative;
  border-radius: 0.4rem;
  transition: 200ms background;
}

div:hover {
  cursor: pointer;
  background: crimson;
}

div::after {
  position: absolute;
  background: white;
  right: -1rem;
  bottom: -1rem;
  height: 2rem;
  width: 2rem;
  content: '';
  transform: rotate(45deg);
}