.centered {
  position: fixed;
  top: 50%;
  left: 50%;
  box-shadow: 0px 32px 64px rgba(0, 0, 0, 0.14);
  border-radius: 24px;
  /* bring your own prefixes */
  transform: translate(-50%, -60%);
}

.link-centered {
  position: fixed;
  top: 50%;
  left: 50%;
  /* bring your own prefixes */
  transform: translate(-50%, 500%);
}