.button {
  padding: 0.6em 0.9em;
  font-size: 1em;
  background-color: transparent;
  border: 0.2em solid;
  border-color: #00ffff #04ff00 #0051ff #d400ff;
  border-radius: 1.5em;
  color: #fff;
  cursor: pointer;
  transition: transform 0.2s ease, border-radius 0.2s ease, color 0.2s ease,
    border-shadow 0.2s ease, border-style 0.2s ease;
}

.button:active {
}

.button:hover {
  transform: scale(1.3);
  border-radius: 1.5em;
  animation: btn-animation 0.4s 0.2s linear infinite;
  color: #00ddff;
}

@keyframes btn-animation {
  0% {
    border-color: #00ffff #04ff00 #0051ff #d400ff;
    transform: rotate(5deg) scale(1.3);
  }

  25% {
    border-color: #d400ff #00ffff #04ff00 #0051ff;
    transform: rotate(-5deg) scale(1.3);
  }

  50% {
    border-color: #0051ff #d400ff #00ffff #04ff00;
    transform: rotate(5deg) scale(1.3);
  }

  75% {
    border-color: #04ff00 #0051ff #d400ff #00ffff;
    transform: rotate(-5deg) scale(1.3);
  }

  100% {
    border-color: #00ffff #04ff00 #0051ff #d400ff;
    transform: rotate(5deg) scale(1.3);
  }
}