Neon Icon Hover Effect

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  :root {
    --bg: #222;
    --clr: #fff;
  }
  body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--bg);
  }
  ul {
    position: relative;
    display: flex;
    gap: 50px;
  }
  ul li {
    position: relative;
    list-style: none;
    width: 80px;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: 0.5s;
  }
  ul li::before {
    content: '';
    position: absolute;
    inset: 30px;
    box-shadow: 0 0 0 10px var(--clr),
                0 0 0 20px var(--bg),
                0 0 0 22px var(--clr);
    transition: 0.5s;
  }
  ul li:hover::before {
    inset: 15px;
  }
  ul li::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--bg);
    transform: rotate(45deg);
    transition: 0.5s;
  }
  ul li:hover::after {
    inset: 0px;
    transform: rotate(0deg);
  }
  ul li a {
    position: relative;
    text-decoration: none;
    z-index: 10;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  ul li a i {
    font-size: 2em;
    transition: 0.5s;
    color: var(--clr);
    opacity: 1;
  }
  ul li:hover a i {
    color: var(--clr);
    transform: translateY(-40%);
  }
  ul li a span {
    position: absolute;
    font-family: sans-serif;
    color: var(--clr);
    opacity: 0;
    transition: 0.5s;
    transform: scale(0) translateY(200%);
  }
  ul li:hover a span {
    opacity: 1;
    transform: scale(1) translateY(100%);
  }
  ul li:hover a i,
  ul li a span {
    filter: drop-shadow(0 0 20px var(--clr)) 
            drop-shadow(0 0 40px var(--clr)) 
            drop-shadow(0 0 60px var(--clr));
  }

- Neon Icon Hover Effect

Live Preview