.neon {
  color: #fff;
  text-shadow:
    0 0 5px #fff,
    0 0 10px #0ff,
    0 0 15px #0ff
}

.neon_btn {
  display: block;
  margin: auto;
  padding: 1rem 1.25rem;
  font-family: sans-serif;
  font-size: 1.5rem;
  text-decoration: none;
  text-shadow:
    -2px 4px 4px #091243,
    0 0 10px #00D0FF,
    inset 1px 1px 1px white;
  color: #1FFFFF;
  border: 2px solid;
  border-radius: 4px;
  background-color: transparent;
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.6),
    2px 1px 4px rgba(0, 0, 0, 0.3),
    2px 4px 3px rgba(3, 0, 128, 0.3),
    0 0 7px 2px rgba(0, 208, 255, 0.6),
    inset 0 1px 2px rgba(0, 0, 0, 0.6),
    inset 2px 1px 4px rgba(0, 0, 0, 0.3),
    inset 2px 4px 3px rgba(3, 0, 128, 0.3),
    inset 0 0 7px 2px rgba(0, 208, 255, 0.6);
  -webkit-animation: flickering 5s infinite;
  animation: flickering 5s infinite;
}

@-webkit-keyframes flickering {
  0% {
    border-color: transparent;
    opacity: 0.2;
  }

  2% {
    border-color: #1FFFFF;
    opacity: 1;
  }

  4% {
    border-color: transparent;
    opacity: 0.2;
  }

  8% {
    border-color: #1FFFFF;
    opacity: 1;
  }

  28% {
    border-color: #1FFFFF;
    opacity: 1;
  }

  30% {
    border-color: transparent;
    opacity: 0.2;
  }

  36% {
    border-color: #1FFFFF;
    opacity: 1;
  }

  100% {
    border-color: #1FFFFF;
    opacity: 1;
  }
}

@keyframes flickering {
  0% {
    border-color: transparent;
    opacity: 0.2;
  }

  2% {
    border-color: #1FFFFF;
    opacity: 1;
  }

  4% {
    border-color: transparent;
    opacity: 0.2;
  }

  8% {
    border-color: #1FFFFF;
    opacity: 1;
  }

  28% {
    border-color: #1FFFFF;
    opacity: 1;
  }

  30% {
    border-color: transparent;
    opacity: 0.2;
  }

  36% {
    border-color: #1FFFFF;
    opacity: 1;
  }

  100% {
    border-color: #1FFFFF;
    opacity: 1;
  }
}