.tns-controls button {
  background: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 512 512'><path d='M256 417.9l17-17L465 209l17-17L448 158.1l-17 17-175 175L81 175l-17-17L30.1 192l17 17L239 401l17 17z'/></svg>");
}