Neon Işıklı Buton

<style>
.neon-btn {
  position: relative;
  display: inline-block;
  padding: 15px 30px;
  color: #fff;
  letter-spacing: 4px;
  font-size: 24px;
  text-decoration: none;
  overflow: hidden;
  transition: 0.2s;
  background: #000;
  box-shadow: 0 0 10px #2196f3, 0 0 40px #2196f3, 0 0 80px #2196f3;
cursor:pointer;
  border-radius: 5px;
}

.neon-btn:hover {
  background: #2196f3;
  color: #255784;
  box-shadow: 0 0 10px #2196f3, 0 0 40px #2196f3, 0 0 80px #2196f3;
}

@keyframes neon-pulse {
  0% {
    box-shadow: 0 0 10px #2196f3, 0 0 40px #2196f3;
  }
  50% {
    box-shadow: 0 0 20px #2196f3, 0 0 60px #2196f3;
  }
  100% {
    box-shadow: 0 0 10px #2196f3, 0 0 40px #2196f3;
  }
}

.neon-btn {
  animation: neon-pulse 1.5s infinite;
}
</style>

<a type="button" onclick="javascript:void(0)" class="neon-btn">NEON BUTON</a>