Neon Glow buttons

<div class="scene">
  <div class="buttons-wrapper">
    <button class="neon-btn btn-cyan">
      <span>EXPLORE</span>
    </button>
    <button class="neon-btn btn-magenta">
      <span>LAUNCH</span>
    </button>
    <button class="neon-btn btn-lime">
      <span>IGNITE</span>
    </button>
  </div>
</div>