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综合讨论
1 
.neon {
        animation: neonAnim 2s alternate-reverse infinite;
        color: #39FF14;
        font-family: Cursive;
        font-size: 72px;
    }
    @keyframes neonAnim {
    from {
        text-shadow:
          0 0 10px rgba(57, 255, 20, .7),
          0 0 40px rgba(57, 255, 20, .7),
          0 0 100px rgba(57, 255, 20, .7);
      }
      to {
        text-shadow:
          0 0 5px rgba(57, 255, 20, .7),
          0 0 20px rgba(57, 255, 20, .7),
          0 0 60px rgba(57, 255, 20, .7);
      }
}