[x-cloak] {
  display: none;
}

.copied {
  position: absolute;
  left: 0; top: 0; right: 0;
  text-align: center;
  opacity: 0;
  transform: translateY(-1em);
  color: #000;
  transition: all .500s;
}

#captcha:valid { text-transform: uppercase; }