JSFiddle - React, Tailwind, and code Playground

HTML

<button>
тест
</button>

CSS

body {
  background: #600;
}

button {
  background: rgba(255,255,255,.3);
  color: #fff;
  border: 3px solid #fff;
}

button:hover {
  background: #fff;
  color: #600;
}